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Vulnerability Details :

CVE-2026-4702

Summary
Assigner-mozilla
Assigner Org ID-f16b083a-5664-49f3-a51e-8d479e5ed7fe
Published At-24 Mar, 2026 | 12:30
Updated At-13 Apr, 2026 | 13:50
Rejected At-
Credits

JIT miscompilation in the JavaScript Engine component

JIT miscompilation in the JavaScript Engine component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
â–¼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:mozilla
Assigner Org ID:f16b083a-5664-49f3-a51e-8d479e5ed7fe
Published At:24 Mar, 2026 | 12:30
Updated At:13 Apr, 2026 | 13:50
Rejected At:
â–¼CVE Numbering Authority (CNA)
JIT miscompilation in the JavaScript Engine component

JIT miscompilation in the JavaScript Engine component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

Affected Products
Vendor
Mozilla CorporationMozilla
Product
Firefox
Versions
Unaffected
  • From 140.9 through 140.* (rpm)
  • From 149 through * (rpm)
Vendor
Mozilla CorporationMozilla
Product
Thunderbird
Versions
Unaffected
  • From 140.9 through 140.* (rpm)
  • From 149 through * (rpm)
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Evyatar Ben Asher, Keane Lucas, Nicholas Carlini, Newton Cheng, Daniel Freeman, Alex Gaynor, and Joel Weinberger using Claude from Anthropic
Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://bugzilla.mozilla.org/show_bug.cgi?id=2013560
N/A
https://www.mozilla.org/security/advisories/mfsa2026-20/
N/A
https://www.mozilla.org/security/advisories/mfsa2026-22/
N/A
https://www.mozilla.org/security/advisories/mfsa2026-23/
N/A
https://www.mozilla.org/security/advisories/mfsa2026-24/
N/A
Hyperlink: https://bugzilla.mozilla.org/show_bug.cgi?id=2013560
Resource: N/A
Hyperlink: https://www.mozilla.org/security/advisories/mfsa2026-20/
Resource: N/A
Hyperlink: https://www.mozilla.org/security/advisories/mfsa2026-22/
Resource: N/A
Hyperlink: https://www.mozilla.org/security/advisories/mfsa2026-23/
Resource: N/A
Hyperlink: https://www.mozilla.org/security/advisories/mfsa2026-24/
Resource: N/A
â–¼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Problem Types
TypeCWE IDDescription
CWECWE-843CWE-843 Access of Resource Using Incompatible Type ('Type Confusion')
Type: CWE
CWE ID: CWE-843
Description: CWE-843 Access of Resource Using Incompatible Type ('Type Confusion')
Metrics
VersionBase scoreBase severityVector
3.19.8CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Version: 3.1
Base score: 9.8
Base severity: CRITICAL
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
Information is not available yet
â–¼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security@mozilla.org
Published At:24 Mar, 2026 | 13:16
Updated At:13 Apr, 2026 | 15:17

JIT miscompilation in the JavaScript Engine component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Primary3.19.8CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Secondary3.19.8CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Type: Primary
Version: 3.1
Base score: 9.8
Base severity: CRITICAL
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Type: Secondary
Version: 3.1
Base score: 9.8
Base severity: CRITICAL
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CPE Matches

Mozilla Corporation
mozilla
>>firefox>>Versions before 140.9.0(exclusive)
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
Mozilla Corporation
mozilla
>>firefox>>Versions before 149.0(exclusive)
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
Weaknesses
CWE IDTypeSource
CWE-843Primarynvd@nist.gov
CWE-843Secondary134c704f-9b21-4f2e-91b3-4a467353bcc0
CWE ID: CWE-843
Type: Primary
Source: nvd@nist.gov
CWE ID: CWE-843
Type: Secondary
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://bugzilla.mozilla.org/show_bug.cgi?id=2013560security@mozilla.org
Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-20/security@mozilla.org
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-22/security@mozilla.org
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-23/security@mozilla.org
N/A
https://www.mozilla.org/security/advisories/mfsa2026-24/security@mozilla.org
N/A
Hyperlink: https://bugzilla.mozilla.org/show_bug.cgi?id=2013560
Source: security@mozilla.org
Resource:
Permissions Required
Hyperlink: https://www.mozilla.org/security/advisories/mfsa2026-20/
Source: security@mozilla.org
Resource:
Vendor Advisory
Hyperlink: https://www.mozilla.org/security/advisories/mfsa2026-22/
Source: security@mozilla.org
Resource:
Vendor Advisory
Hyperlink: https://www.mozilla.org/security/advisories/mfsa2026-23/
Source: security@mozilla.org
Resource: N/A
Hyperlink: https://www.mozilla.org/security/advisories/mfsa2026-24/
Source: security@mozilla.org
Resource: N/A

Change History

0
Information is not available yet

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EPSS-0.28% / 20.10%
||
7 Day CHG~0.00%
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Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
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Action-Not Available
Vendor-Mozilla Corporation
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CWE ID-CWE-693
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Matching Score-8
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Matching Score-8
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CVSS Score-9.8||CRITICAL
EPSS-0.39% / 32.03%
||
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Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
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CVSS Score-9.8||CRITICAL
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||
7 Day CHG~0.00%
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Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
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Action-Not Available
Vendor-Mozilla Corporation
Product-thunderbirdfirefoxThunderbirdFirefox
CWE ID-CWE-416
Use After Free
CWE ID-CWE-476
NULL Pointer Dereference
CWE ID-CWE-824
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Matching Score-8
Assigner-Mozilla Corporation
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Matching Score-8
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.38% / 30.16%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:38
Updated-24 Jul, 2026 | 16:41
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Sandbox escape in the DOM: Networking component

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Action-Not Available
Vendor-Mozilla Corporation
Product-thunderbirdfirefoxThunderbirdFirefox
CWE ID-CWE-693
Protection Mechanism Failure
CVE-2026-16389
Matching Score-8
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Matching Score-8
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.42% / 34.62%
||
7 Day CHG~0.00%
Published-21 Jul, 2026 | 12:38
Updated-24 Jul, 2026 | 16:41
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Incorrect boundary conditions, integer overflow in the Libraries component in NSS

Incorrect boundary conditions, integer overflow in the Libraries component in NSS. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

Action-Not Available
Vendor-Mozilla Corporation
Product-thunderbirdfirefoxThunderbirdFirefox
CWE ID-CWE-190
Integer Overflow or Wraparound
CVE-2026-14241
Matching Score-8
Assigner-Mozilla Corporation
ShareView Details
Matching Score-8
Assigner-Mozilla Corporation
CVSS Score-7.5||HIGH
EPSS-0.25% / 16.64%
||
7 Day CHG+0.02%
Published-30 Jun, 2026 | 13:32
Updated-06 Jul, 2026 | 16:16
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Memory safety bugs fixed in Firefox 152.0.4

Memory safety bugs present in Firefox 152.0.3. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 152.0.4.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxFirefox
CWE ID-CWE-119
Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE ID-CWE-787
Out-of-bounds Write
CVE-2026-12293
Matching Score-8
Assigner-Mozilla Corporation
ShareView Details
Matching Score-8
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.30% / 22.48%
||
7 Day CHG~0.00%
Published-16 Jun, 2026 | 11:52
Updated-15 Jul, 2026 | 02:18
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Use-after-free in the Graphics: WebGPU component

Use-after-free in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 152 and Thunderbird 152.

Action-Not Available
Vendor-Red Hat, Inc.Mozilla Corporation
Product-thunderbirdfirefoxThunderbirdFirefoxRed Hat Enterprise Linux 9Red Hat Enterprise Linux 7Red Hat Enterprise Linux 6Red Hat Enterprise Linux 8Red Hat Enterprise Linux 10
CWE ID-CWE-416
Use After Free
CWE ID-CWE-825
Expired Pointer Dereference
CVE-2026-0892
Matching Score-8
Assigner-Mozilla Corporation
ShareView Details
Matching Score-8
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.40% / 33.06%
||
7 Day CHG~0.00%
Published-13 Jan, 2026 | 13:30
Updated-13 Apr, 2026 | 15:17
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Memory safety bugs fixed in Firefox 147 and Thunderbird 147

Memory safety bugs present in Firefox 146 and Thunderbird 146. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 147 and Thunderbird 147.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxthunderbirdThunderbirdFirefox
CWE ID-CWE-119
Improper Restriction of Operations within the Bounds of a Memory Buffer
CVE-2026-0884
Matching Score-8
Assigner-Mozilla Corporation
ShareView Details
Matching Score-8
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.42% / 34.70%
||
7 Day CHG~0.00%
Published-13 Jan, 2026 | 13:30
Updated-13 Apr, 2026 | 15:17
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Use-after-free in the JavaScript Engine component

Use-after-free in the JavaScript Engine component. This vulnerability was fixed in Firefox 147, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxthunderbirdThunderbirdFirefox
CWE ID-CWE-416
Use After Free
CVE-2026-0879
Matching Score-8
Assigner-Mozilla Corporation
ShareView Details
Matching Score-8
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.53% / 41.40%
||
7 Day CHG~0.00%
Published-13 Jan, 2026 | 13:30
Updated-15 Jul, 2026 | 02:17
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Sandbox escape due to incorrect boundary conditions in the Graphics component

Sandbox escape due to incorrect boundary conditions in the Graphics component. This vulnerability was fixed in Firefox 147, Firefox ESR 115.32, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.

Action-Not Available
Vendor-Red Hat, Inc.Mozilla Corporation
Product-thunderbirdfirefoxThunderbirdFirefoxRed Hat Enterprise Linux 8.6 Update Services for SAP SolutionsRed Hat Enterprise Linux 7Red Hat Enterprise Linux 6Red Hat Enterprise Linux 9.0 Update Services for SAP SolutionsRed Hat Enterprise Linux 9.4 Extended Update SupportRed Hat Enterprise Linux 8.2 Advanced Update SupportRed Hat Enterprise Linux 10Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRed Hat Enterprise Linux 8.8 Telecommunications Update ServiceRed Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnRed Hat Enterprise Linux 9Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsRed Hat Enterprise Linux 9.6 Extended Update SupportRed Hat Enterprise Linux 8Red Hat Enterprise Linux 7 Extended Lifecycle SupportRed Hat Enterprise Linux 8.6 Telecommunications Update ServiceRed Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRed Hat Enterprise Linux 10.0 Extended Update Support
CWE ID-CWE-119
Improper Restriction of Operations within the Bounds of a Memory Buffer
CVE-2025-9179
Matching Score-8
Assigner-Mozilla Corporation
ShareView Details
Matching Score-8
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.56% / 43.46%
||
7 Day CHG+0.03%
Published-19 Aug, 2025 | 20:33
Updated-13 Apr, 2026 | 15:17
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Sandbox escape due to invalid pointer in the Audio/Video: GMP component

An attacker was able to perform memory corruption in the GMP process which processes encrypted media. This process is also heavily sandboxed, but represents slightly different privileges from the content process. This vulnerability was fixed in Firefox 142, Firefox ESR 115.27, Firefox ESR 128.14, Firefox ESR 140.2, Thunderbird 142, Thunderbird 128.14, and Thunderbird 140.2.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxthunderbirdThunderbirdFirefox
CWE ID-CWE-119
Improper Restriction of Operations within the Bounds of a Memory Buffer
CVE-2025-9187
Matching Score-8
Assigner-Mozilla Corporation
ShareView Details
Matching Score-8
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.45% / 37.06%
||
7 Day CHG+0.03%
Published-19 Aug, 2025 | 20:33
Updated-13 Apr, 2026 | 15:17
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Memory safety bugs fixed in Firefox 142 and Thunderbird 142

Memory safety bugs present in Firefox 141 and Thunderbird 141. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 142 and Thunderbird 142.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxthunderbirdThunderbirdFirefox
CWE ID-CWE-119
Improper Restriction of Operations within the Bounds of a Memory Buffer
CVE-2024-7521
Matching Score-8
Assigner-Mozilla Corporation
ShareView Details
Matching Score-8
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.62% / 45.89%
||
7 Day CHG~0.00%
Published-06 Aug, 2024 | 12:38
Updated-12 Aug, 2024 | 16:05
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Incomplete WebAssembly exception handing could have led to a use-after-free. This vulnerability affects Firefox < 129, Firefox ESR < 115.14, Firefox ESR < 128.1, Thunderbird < 128.1, and Thunderbird < 115.14.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxthunderbirdfirefox_esrFirefoxFirefox ESRThunderbirdfirefoxthunderbirdfirefox_esr
CWE ID-CWE-755
Improper Handling of Exceptional Conditions
CVE-2025-8028
Matching Score-8
Assigner-Mozilla Corporation
ShareView Details
Matching Score-8
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.47% / 37.95%
||
7 Day CHG-0.00%
Published-22 Jul, 2025 | 20:49
Updated-13 Apr, 2026 | 15:17
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Large branch table could lead to truncated instruction

On arm64, a WASM `br_table` instruction with a lot of entries could lead to the label being too far from the instruction causing truncation and incorrect computation of the branch address. This vulnerability was fixed in Firefox 141, Firefox ESR 115.26, Firefox ESR 128.13, Firefox ESR 140.1, Thunderbird 141, Thunderbird 128.13, and Thunderbird 140.1.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxthunderbirdThunderbirdFirefox
CWE ID-CWE-1332
Improper Handling of Faults that Lead to Instruction Skips
CVE-2025-8031
Matching Score-8
Assigner-Mozilla Corporation
ShareView Details
Matching Score-8
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.43% / 35.08%
||
7 Day CHG-0.00%
Published-22 Jul, 2025 | 20:49
Updated-13 Apr, 2026 | 15:17
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Incorrect URL stripping in CSP reports

The `username:password` part was not correctly stripped from URLs in CSP reports potentially leaking HTTP Basic Authentication credentials. This vulnerability was fixed in Firefox 141, Firefox ESR 128.13, Firefox ESR 140.1, Thunderbird 141, Thunderbird 128.13, and Thunderbird 140.1.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxthunderbirdThunderbirdFirefox
CWE ID-CWE-276
Incorrect Default Permissions
CVE-2025-8038
Matching Score-8
Assigner-Mozilla Corporation
ShareView Details
Matching Score-8
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.22% / 13.38%
||
7 Day CHG~0.00%
Published-22 Jul, 2025 | 20:49
Updated-13 Apr, 2026 | 15:17
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
CSP frame-src was not correctly enforced for paths

Thunderbird ignored paths when checking the validity of navigations in a frame. This vulnerability was fixed in Firefox 141, Firefox ESR 140.1, Thunderbird 141, and Thunderbird 140.1.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxthunderbirdThunderbirdFirefox
CWE ID-CWE-345
Insufficient Verification of Data Authenticity
CVE-2022-36320
Matching Score-8
Assigner-Mozilla Corporation
ShareView Details
Matching Score-8
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.66% / 47.65%
||
7 Day CHG~0.00%
Published-22 Dec, 2022 | 00:00
Updated-15 Apr, 2025 | 17:15
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Mozilla developers and the Mozilla Fuzzing Team reported memory safety bugs present in Firefox 102. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 103.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxFirefox
CWE ID-CWE-787
Out-of-bounds Write
CVE-2025-8043
Matching Score-8
Assigner-Mozilla Corporation
ShareView Details
Matching Score-8
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.37% / 29.34%
||
7 Day CHG~0.00%
Published-22 Jul, 2025 | 20:49
Updated-13 Apr, 2026 | 15:17
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Incorrect URL truncation

Focus incorrectly truncated URLs towards the beginning instead of around the origin. This vulnerability was fixed in Firefox 141.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxthunderbirdFirefox
CWE ID-CWE-451
User Interface (UI) Misrepresentation of Critical Information
CVE-2025-8044
Matching Score-8
Assigner-Mozilla Corporation
ShareView Details
Matching Score-8
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.43% / 35.68%
||
7 Day CHG~0.00%
Published-22 Jul, 2025 | 20:49
Updated-13 Apr, 2026 | 15:17
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Memory safety bugs fixed in Firefox 141 and Thunderbird 141

Memory safety bugs present in Firefox 140 and Thunderbird 140. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 141 and Thunderbird 141.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxthunderbirdThunderbirdFirefox
CWE ID-CWE-119
Improper Restriction of Operations within the Bounds of a Memory Buffer
CVE-2025-8042
Matching Score-8
Assigner-Mozilla Corporation
ShareView Details
Matching Score-8
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.45% / 37.03%
||
7 Day CHG+0.03%
Published-19 Aug, 2025 | 20:52
Updated-13 Apr, 2026 | 15:17
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Sandboxed iframe could start downloads

Firefox for Android allowed a sandboxed iframe without the `allow-downloads` attribute to start downloads. This vulnerability was fixed in Firefox 141.

Action-Not Available
Vendor-Google LLCMozilla Corporation
Product-firefoxandroidFirefox
CWE ID-CWE-732
Incorrect Permission Assignment for Critical Resource
CVE-2022-34470
Matching Score-8
Assigner-Mozilla Corporation
ShareView Details
Matching Score-8
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-1.06% / 61.16%
||
7 Day CHG~0.00%
Published-22 Dec, 2022 | 00:00
Updated-15 Apr, 2025 | 19:16
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Session history navigations may have led to a use-after-free and potentially exploitable crash. This vulnerability affects Firefox < 102, Firefox ESR < 91.11, Thunderbird < 102, and Thunderbird < 91.11.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefox_esrthunderbirdfirefoxThunderbirdFirefox ESRFirefox
CWE ID-CWE-416
Use After Free
CVE-2023-4058
Matching Score-8
Assigner-Mozilla Corporation
ShareView Details
Matching Score-8
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.63% / 46.64%
||
7 Day CHG~0.00%
Published-01 Aug, 2023 | 15:02
Updated-13 Feb, 2025 | 17:08
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Memory safety bugs present in Firefox 115. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 116.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxFirefox
CWE ID-CWE-787
Out-of-bounds Write
CVE-2023-4057
Matching Score-8
Assigner-Mozilla Corporation
ShareView Details
Matching Score-8
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.87% / 55.17%
||
7 Day CHG+0.14%
Published-01 Aug, 2023 | 15:01
Updated-22 Oct, 2024 | 14:24
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Memory safety bugs present in Firefox 115, Firefox ESR 115.0, and Thunderbird 115.0. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 116, Firefox ESR < 115.1, and Thunderbird < 115.1.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxfirefox_esrFirefoxFirefox ESRThunderbirdfirefoxthunderbirdfirefox_esr
CWE ID-CWE-787
Out-of-bounds Write
CVE-2025-55031
Matching Score-8
Assigner-Mozilla Corporation
ShareView Details
Matching Score-8
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.41% / 33.96%
||
7 Day CHG+0.03%
Published-19 Aug, 2025 | 20:52
Updated-13 Apr, 2026 | 15:17
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Passkey phishing within Bluetooth range

Malicious pages could use Firefox for iOS to pass FIDO: links to the OS and trigger the hybrid passkey transport. An attacker within Bluetooth range could have used this to trick the user into using their passkey to log the attacker's computer into the target account. This vulnerability was fixed in Firefox for iOS 142 and Focus for iOS 142.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxfirefox_focusFirefox for iOSFocus for iOS
CWE ID-CWE-601
URL Redirection to Untrusted Site ('Open Redirect')
CVE-2022-34476
Matching Score-8
Assigner-Mozilla Corporation
ShareView Details
Matching Score-8
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.70% / 49.37%
||
7 Day CHG~0.00%
Published-22 Dec, 2022 | 00:00
Updated-15 Apr, 2025 | 19:16
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

ASN.1 parsing of an indefinite SEQUENCE inside an indefinite GROUP could have resulted in the parser accepting malformed ASN.1. This vulnerability affects Firefox < 102.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxFirefox
CWE ID-CWE-20
Improper Input Validation
CVE-2024-7530
Matching Score-8
Assigner-Mozilla Corporation
ShareView Details
Matching Score-8
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.38% / 30.73%
||
7 Day CHG~0.00%
Published-06 Aug, 2024 | 12:38
Updated-12 Aug, 2024 | 16:09
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Incorrect garbage collection interaction could have led to a use-after-free. This vulnerability affects Firefox < 129.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxFirefoxfirefox
CWE ID-CWE-416
Use After Free
CVE-2026-6748
Matching Score-8
Assigner-Mozilla Corporation
ShareView Details
Matching Score-8
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.40% / 32.53%
||
7 Day CHG~0.00%
Published-21 Apr, 2026 | 12:40
Updated-15 Jul, 2026 | 02:48
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Uninitialized memory in the Audio/Video: Web Codecs component

Uninitialized memory in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

Action-Not Available
Vendor-Red Hat, Inc.Mozilla Corporation
Product-thunderbirdfirefoxThunderbirdFirefoxRed Hat Enterprise Linux 8.6 Update Services for SAP SolutionsRed Hat Enterprise Linux 7Red Hat Enterprise Linux 6Red Hat Enterprise Linux 9.0 Update Services for SAP SolutionsRed Hat Enterprise Linux 9.4 Extended Update SupportRed Hat Enterprise Linux 10Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRed Hat Enterprise Linux 8.8 Telecommunications Update ServiceRed Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnRed Hat Enterprise Linux 9Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsRed Hat Enterprise Linux 9.6 Extended Update SupportRed Hat Enterprise Linux 8Red Hat Enterprise Linux 7 Extended Lifecycle SupportRed Hat Enterprise Linux 8.6 Telecommunications Update ServiceRed Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRed Hat Enterprise Linux 10.0 Extended Update Support
CWE ID-CWE-457
Use of Uninitialized Variable
CWE ID-CWE-824
Access of Uninitialized Pointer
CVE-2026-6760
Matching Score-8
Assigner-Mozilla Corporation
ShareView Details
Matching Score-8
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.28% / 20.10%
||
7 Day CHG~0.00%
Published-21 Apr, 2026 | 12:40
Updated-26 May, 2026 | 17:49
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Mitigation bypass in the Networking: Cookies component

Mitigation bypass in the Networking: Cookies component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.

Action-Not Available
Vendor-Mozilla Corporation
Product-thunderbirdfirefoxFirefoxThunderbird
CWE ID-CWE-288
Authentication Bypass Using an Alternate Path or Channel
CVE-2025-54143
Matching Score-8
Assigner-Mozilla Corporation
ShareView Details
Matching Score-8
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.48% / 38.77%
||
7 Day CHG+0.03%
Published-19 Aug, 2025 | 20:52
Updated-13 Apr, 2026 | 15:17
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Sandboxed iframes could allow local downloads despite sandbox restrictions

Sandboxed iframes on webpages could potentially allow downloads to the device, bypassing the expected sandbox restrictions declared on the parent page. This vulnerability was fixed in Firefox for iOS 141.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxFirefox for iOS
CWE ID-CWE-693
Protection Mechanism Failure
CVE-2025-49710
Matching Score-8
Assigner-Mozilla Corporation
ShareView Details
Matching Score-8
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.68% / 48.42%
||
7 Day CHG+0.02%
Published-11 Jun, 2025 | 12:07
Updated-13 Apr, 2026 | 15:16
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Integer overflow in OrderedHashTable

An integer overflow was present in `OrderedHashTable` used by the JavaScript engine. This vulnerability was fixed in Firefox 139.0.4.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxFirefox
CWE ID-CWE-190
Integer Overflow or Wraparound
CVE-2022-29917
Matching Score-8
Assigner-Mozilla Corporation
ShareView Details
Matching Score-8
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-1.00% / 59.38%
||
7 Day CHG~0.00%
Published-22 Dec, 2022 | 00:00
Updated-15 Apr, 2025 | 15:15
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Mozilla developers Andrew McCreight, Gabriele Svelto, Tom Ritter and the Mozilla Fuzzing Team reported memory safety bugs present in Firefox 99 and Firefox ESR 91.8. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Thunderbird < 91.9, Firefox ESR < 91.9, and Firefox < 100.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefox_esrthunderbirdfirefoxThunderbirdFirefox ESRFirefox
CWE ID-CWE-787
Out-of-bounds Write
CVE-2025-49709
Matching Score-8
Assigner-Mozilla Corporation
ShareView Details
Matching Score-8
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.60% / 45.17%
||
7 Day CHG+0.02%
Published-11 Jun, 2025 | 12:07
Updated-13 Apr, 2026 | 15:16
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Memory corruption in canvas surfaces

Certain canvas operations could have lead to memory corruption. This vulnerability was fixed in Firefox 139.0.4.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxFirefox
CWE ID-CWE-787
Out-of-bounds Write
CVE-2024-6611
Matching Score-8
Assigner-Mozilla Corporation
ShareView Details
Matching Score-8
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.66% / 47.91%
||
7 Day CHG~0.00%
Published-09 Jul, 2024 | 14:25
Updated-30 Oct, 2025 | 16:15
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Incorrect handling of SameSite cookies

A nested iframe, triggering a cross-site navigation, could send SameSite=Strict or Lax cookies. This vulnerability affects Firefox < 128 and Thunderbird < 128.

Action-Not Available
Vendor-Mozilla Corporation
Product-thunderbirdfirefoxFirefoxThunderbirdfirefox
CWE ID-CWE-1275
Sensitive Cookie with Improper SameSite Attribute
CVE-2026-6768
Matching Score-8
Assigner-Mozilla Corporation
ShareView Details
Matching Score-8
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.29% / 20.67%
||
7 Day CHG~0.00%
Published-21 Apr, 2026 | 12:41
Updated-27 May, 2026 | 17:09
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Mitigation bypass in the Networking: Cookies component

Mitigation bypass in the Networking: Cookies component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.

Action-Not Available
Vendor-Mozilla Corporation
Product-thunderbirdfirefoxFirefoxThunderbird
CWE ID-CWE-288
Authentication Bypass Using an Alternate Path or Channel
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