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.
Fix
Patch, vendor advisory and mitigation references on NVD 4
- https://www.mozilla.org/security/advisories/mfsa2025-73/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-75/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-77/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-78/ Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 6.5 · mozillaNVD modified 2026-10-18 21:10
Affected (CPE criteria) 3
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
References 7
- https://bugzilla.mozilla.org/show_bug.cgi?id=1979502 Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2025-73/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-75/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-77/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-78/ Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2025/09/msg00020.html
- https://lists.debian.org/debian-lts-announce/2025/09/msg00026.html