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Memory safety bugs present in Firefox 137, Thunderbird 137, Firefox ESR 128.9, and Thunderbird 128.9. 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 < 138, Firefox ESR < 128.10, Thunderbird < 138, and Thunderbird < 128.10.
Reserved 2025-04-29 | Published 2025-04-29 | Updated 2025-05-01 | Assigner mozillaMemory safety bugs fixed in Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderbird 128.10
Maurice Dauer and the Mozilla Fuzzing Team
bugzilla.mozilla.org/buglist.cgi?bug_id=1951161%2C1952105 (Memory safety bugs fixed in Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderbird 128.10)
www.mozilla.org/security/advisories/mfsa2025-28/
www.mozilla.org/security/advisories/mfsa2025-29/
www.mozilla.org/security/advisories/mfsa2025-31/
www.mozilla.org/security/advisories/mfsa2025-32/
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