CVE-2026-4371

Published: Mar 24, 2026 Last Modified: Mar 24, 2026
ExploitDB:
Other exploit source:
Google Dorks:

Description

AI Translation Available

A malicious mail server could send malformed strings with negative lengths, causing the parser to read memory outside the buffer. If a mail server or connection to a mail server were compromised, an attacker could cause the parser to malfunction, potentially crashing Thunderbird or leaking sensitive data. This vulnerability affects Thunderbird < 149 and Thunderbird < 140.9.

https://bugzilla.mozilla.org/show_bug.cgi?id=2023493
https://bugzilla.mozilla.org/show_bug.cgi?id=2023493
https://www.mozilla.org/security/advisories/mfsa2026-23/
https://www.mozilla.org/security/advisories/mfsa2026-23/
https://www.mozilla.org/security/advisories/mfsa2026-24/
https://www.mozilla.org/security/advisories/mfsa2026-24/