Description
Incorrect boundary conditions in the JavaScript: GC component. This vulnerability was fixed in Firefox 143, Firefox ESR 140.3, Thunderbird 143, and Thunderbird 140.3.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Mozilla Firefox
140.3 to ≤ 140.*unaffected143 to ≤ *unaffected
Mozilla Thunderbird
140.3 to ≤ 140.*unaffected143 to ≤ *unaffected
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1979502 ↗
- https://www.mozilla.org/security/advisories/mfsa2025-73/ ↗
- https://www.mozilla.org/security/advisories/mfsa2025-75/ ↗
- https://www.mozilla.org/security/advisories/mfsa2025-77/ ↗
- https://www.mozilla.org/security/advisories/mfsa2025-78/ ↗
- https://lists.debian.org/debian-lts-announce/2025/09/msg00026.html ↗
- https://lists.debian.org/debian-lts-announce/2025/09/msg00020.html ↗