CVE-2026-12327

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.

• CWE-119

• https://bugzilla.mozilla.org/buglist.cgi?bug_id=2011842%2C2023902%2C2025512%2C2027312%2C2029444%2C2036571%2C2036900%2C2036936%2C2037995%2C2038551%2C2040717%2C2042724Broken 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

Published

Jun 16, 2026

Last Modified

Oct 26, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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