Description
Memory safety bugs present in Firefox 134, Thunderbird 134, Firefox ESR 128.6, and Thunderbird 128.6. 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 affects Firefox < 135, Firefox ESR < 128.7, Thunderbird < 128.7, and Thunderbird < 135.
Problem types
Memory safety bugs fixed in Firefox 135, Thunderbird 135, Firefox ESR 128.7, and Thunderbird 128.7
Product status
Credits
Sebastian Hengst, Maurice Dauer and the Mozilla Fuzzing Team
References
lists.debian.org/debian-lts-announce/2025/02/msg00006.html
bugzilla.mozilla.org/...i?bug_id=1926256%2C1935984%2C1935471 (Memory safety bugs fixed in Firefox 135, Thunderbird 135, Firefox ESR 128.7, and Thunderbird 128.7)
www.mozilla.org/security/advisories/mfsa2025-07/
www.mozilla.org/security/advisories/mfsa2025-09/
www.mozilla.org/security/advisories/mfsa2025-10/
www.mozilla.org/security/advisories/mfsa2025-11/