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CVE Vulnerability Details :
CVE-2026-2765
PUBLISHED
More InfoOfficial Page
Assigner-mozilla
Assigner Org ID-f16b083a-5664-49f3-a51e-8d479e5ed7fe
View Known Exploited Vulnerability (KEV) details
Published At-24 Feb, 2026 | 13:33
Updated At-28 Feb, 2026 | 02:31
Rejected At-
▼CVE Numbering Authority (CNA)
Use-after-free in the JavaScript Engine component

Use-after-free in the JavaScript Engine component. This vulnerability affects Firefox < 148, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8.

Affected Products
Vendor
Mozilla CorporationMozilla
Product
Firefox
Versions
Affected
  • From unspecified before 148 (custom)
Vendor
Mozilla CorporationMozilla
Product
Firefox ESR
Versions
Affected
  • From unspecified before 140.8 (custom)
Vendor
Mozilla CorporationMozilla
Product
Thunderbird
Versions
Affected
  • From unspecified before 148 (custom)
Vendor
Mozilla CorporationMozilla
Product
Thunderbird
Versions
Affected
  • From unspecified before 140.8 (custom)
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Information to follow
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://bugzilla.mozilla.org/show_bug.cgi?id=2013562
N/A
https://www.mozilla.org/security/advisories/mfsa2026-13/
N/A
https://www.mozilla.org/security/advisories/mfsa2026-15/
N/A
https://www.mozilla.org/security/advisories/mfsa2026-16/
N/A
https://www.mozilla.org/security/advisories/mfsa2026-17/
N/A
Hyperlink: https://bugzilla.mozilla.org/show_bug.cgi?id=2013562
Resource: N/A
Hyperlink: https://www.mozilla.org/security/advisories/mfsa2026-13/
Resource: N/A
Hyperlink: https://www.mozilla.org/security/advisories/mfsa2026-15/
Resource: N/A
Hyperlink: https://www.mozilla.org/security/advisories/mfsa2026-16/
Resource: N/A
Hyperlink: https://www.mozilla.org/security/advisories/mfsa2026-17/
Resource: N/A
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Problem Types
TypeCWE IDDescription
CWECWE-416CWE-416 Use After Free
Type: CWE
CWE ID: CWE-416
Description: CWE-416 Use After Free
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
Details not found