PT-2026-27401 · Mozilla · Firefox+2
Gary Kwong
·
Published
2026-01-01
·
Updated
2026-04-17
·
CVE-2026-4702
CVSS v3.1
9.8
Critical
| Vector | AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Name of the Vulnerable Software and Affected Versions
Firefox versions prior to 149
Firefox ESR versions prior to 140.9
Thunderbird versions prior to 149
Thunderbird versions prior to 140.9
Description
The JavaScript Engine component contains a JIT miscompilation issue.
Recommendations
Update Firefox to version 149 or later.
Update Firefox ESR to version 140.9 or later.
Update Thunderbird to version 149 or later.
Update Thunderbird to version 140.9 or later.
Fix
Type Confusion
Found an issue in the description? Have something to add? Feel free to write us 👾
Weakness Enumeration
Related Identifiers
Affected Products
Firefox
Firefox Esr
Thunderbird