Memory safety bugs present in Firefox ESR 140.11, Thunderbird ESR 140.11, Firefox 151 and Thunderbird 151. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.
Fix
Patch, vendor advisory and mitigation references on NVD 4
- https://www.mozilla.org/security/advisories/mfsa2026-57/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-58/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-60/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-61/ 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 8.1 · mozillaNVD modified 2026-10-26 12:10
Affected (CPE criteria) 4
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*
References 5
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2011842%2C2023902%2C2025512%2C2027312%2C2029444%2C2036571%2C2036900%2C2036936%2C2037995%2C2038551%2C2040717%2C2042724 Broken Link
- https://www.mozilla.org/security/advisories/mfsa2026-57/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-58/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-60/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-61/ Vendor Advisory