CVE-2025-4091

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 was fixed in Firefox 138, Firefox ESR 128.10, Thunderbird 138, and Thunderbird 128.10.

• CWE-119

• https://bugzilla.mozilla.org/buglist.cgi?bug_id=1951161%2C1952105Broken Link
• https://www.mozilla.org/security/advisories/mfsa2025-28/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2025-29/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2025-31/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2025-32/Vendor Advisory
• https://lists.debian.org/debian-lts-announce/2025/05/msg00024.html

Published

Apr 29, 2025

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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