CVE-2026-84145

Internally found bugs present in Thunderbird 154, Thunderbird ESR 153.1 and Thunderbird ESR 140.14. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.

• CWE-119

• https://bugzilla.mozilla.org/buglist.cgi?bug_id=2054640%2C2054650%2C2054652%2C2055693%2C2055705%2C2058051%2C2058652%2C2058660%2C2059027%2C2061220%2C2061242%2C2061285%2C2061300%2C2061316%2C2061397Broken Link
• https://bugzilla.mozilla.org/buglist.cgi?bug_id=2058001%2C2059139%2C2062400%2C2062419Broken Link
• https://bugzilla.mozilla.org/show_bug.cgi?id=2055678Permissions Required
• https://www.mozilla.org/security/advisories/mfsa2026-82/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2026-83/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2026-84/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2026-85/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2026-86/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2026-87/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2026-88/Vendor Advisory

Published

Sep 1, 2026

Last Modified

Sep 3, 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.
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