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CVE Vulnerability Details :
CVE-2026-12299
PUBLISHED
More InfoOfficial Page
Assigner-mozilla
Assigner Org ID-f16b083a-5664-49f3-a51e-8d479e5ed7fe
View Known Exploited Vulnerability (KEV) details
Published At-16 Jun, 2026 | 11:52
Updated At-30 Jun, 2026 | 12:05
Rejected At-
▼CVE Numbering Authority (CNA)
JIT miscompilation in the DOM: Core & HTML component

JIT miscompilation in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.

Affected Products
Vendor
Mozilla CorporationMozilla
Product
Firefox
Versions
Unaffected
  • From 115.37 through 115.* (rpm)
  • From 140.12 through 140.* (rpm)
  • From 152 through * (rpm)
Vendor
Mozilla CorporationMozilla
Product
Thunderbird
Versions
Unaffected
  • From 140.12 through 140.* (rpm)
  • From 152 through * (rpm)
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Hyeonjun Ahn
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://bugzilla.mozilla.org/show_bug.cgi?id=2043139
N/A
https://www.mozilla.org/security/advisories/mfsa2026-57/
N/A
https://www.mozilla.org/security/advisories/mfsa2026-58/
N/A
https://www.mozilla.org/security/advisories/mfsa2026-59/
N/A
https://www.mozilla.org/security/advisories/mfsa2026-60/
N/A
https://www.mozilla.org/security/advisories/mfsa2026-61/
N/A
Hyperlink: https://bugzilla.mozilla.org/show_bug.cgi?id=2043139
Resource: N/A
Hyperlink: https://www.mozilla.org/security/advisories/mfsa2026-57/
Resource: N/A
Hyperlink: https://www.mozilla.org/security/advisories/mfsa2026-58/
Resource: N/A
Hyperlink: https://www.mozilla.org/security/advisories/mfsa2026-59/
Resource: N/A
Hyperlink: https://www.mozilla.org/security/advisories/mfsa2026-60/
Resource: N/A
Hyperlink: https://www.mozilla.org/security/advisories/mfsa2026-61/
Resource: N/A
▼Authorized Data Publishers (ADP)
1. 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
3.15.4MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Version: 3.1
Base score: 5.4
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
2. firefox: thunderbird: JIT miscompilation in the DOM: Core & HTML component

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: JIT miscompilation in the DOM: Core & HTML component

Affected Products
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat Enterprise Linux AppStream (v. 10)
CPEs
  • cpe:/o:redhat:enterprise_linux:10.2
Default Status
affected
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat Enterprise Linux AppStream (v. 8)
CPEs
  • cpe:/a:redhat:enterprise_linux:8::appstream
Default Status
affected
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat Enterprise Linux AppStream (v. 9)
CPEs
  • cpe:/a:redhat:enterprise_linux:9::appstream
Default Status
affected
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat Enterprise Linux 10
CPEs
  • cpe:/o:redhat:enterprise_linux:10
Default Status
affected
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat Enterprise Linux 6
CPEs
  • cpe:/o:redhat:enterprise_linux:6
Default Status
affected
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat Enterprise Linux 7
CPEs
  • cpe:/o:redhat:enterprise_linux:7
Default Status
affected
Problem Types
TypeCWE IDDescription
CWECWE-733Compiler Optimization Removal or Modification of Security-critical Code
Type: CWE
CWE ID: CWE-733
Description: Compiler Optimization Removal or Modification of Security-critical Code
Metrics
VersionBase scoreBase severityVector
3.17.5HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Version: 3.1
Base score: 7.5
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Metrics Other Info
Red Hat severity rating
value:
Important
namespace:
https://access.redhat.com/security/updates/classification/
Impacts
CAPEC IDDescription
Solutions

RHSA-2026:27733: Red Hat Enterprise Linux AppStream (v. 10)

RHSA-2026:30846: Red Hat Enterprise Linux AppStream (v. 10)

RHSA-2026:27717: Red Hat Enterprise Linux AppStream (v. 8)

RHSA-2026:33445: Red Hat Enterprise Linux AppStream (v. 8)

RHSA-2026:27734: Red Hat Enterprise Linux AppStream (v. 9)

RHSA-2026:29940: Red Hat Enterprise Linux AppStream (v. 9)

Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Reported to Red Hat.2026-06-16 14:01:13
Made public.2026-06-16 11:52:32
Event: Reported to Red Hat.
Date: 2026-06-16 14:01:13
Event: Made public.
Date: 2026-06-16 11:52:32
Replaced By
Rejected Reason
References
HyperlinkResource
https://access.redhat.com/security/cve/CVE-2026-12299
vdb-entry
x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2489212
issue-tracking
x_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12299.json
x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:27733
vendor-advisory
x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:30846
vendor-advisory
x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:27717
vendor-advisory
x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:33445
vendor-advisory
x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:27734
vendor-advisory
x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:29940
vendor-advisory
x_refsource_REDHAT
Hyperlink: https://access.redhat.com/security/cve/CVE-2026-12299
Resource:
vdb-entry
x_refsource_REDHAT
Hyperlink: https://bugzilla.redhat.com/show_bug.cgi?id=2489212
Resource:
issue-tracking
x_refsource_REDHAT
Hyperlink: https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12299.json
Resource:
x_sadp-csaf-vex
Hyperlink: https://access.redhat.com/errata/RHSA-2026:27733
Resource:
vendor-advisory
x_refsource_REDHAT
Hyperlink: https://access.redhat.com/errata/RHSA-2026:30846
Resource:
vendor-advisory
x_refsource_REDHAT
Hyperlink: https://access.redhat.com/errata/RHSA-2026:27717
Resource:
vendor-advisory
x_refsource_REDHAT
Hyperlink: https://access.redhat.com/errata/RHSA-2026:33445
Resource:
vendor-advisory
x_refsource_REDHAT
Hyperlink: https://access.redhat.com/errata/RHSA-2026:27734
Resource:
vendor-advisory
x_refsource_REDHAT
Hyperlink: https://access.redhat.com/errata/RHSA-2026:29940
Resource:
vendor-advisory
x_refsource_REDHAT
Details not found