CVE-2026-92239

Buffer overrun in IMAP

State: Published
Severity: 8.1 High
Published: Sep 15, 2026
Updated: Sep 22, 2026
Reserved: Sep 15, 2026

Description

A maliciously constructed IMAP line could cause an out-of-bounds buffer read. This vulnerability was fixed in Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.

Scores

CVSS	Score	Vector	Source
3.1	8.1 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H	CISA-ADP

Weaknesses

CWE-125 Out-of-bounds Read

Affected Products

Product	Versions
ThunderbirdMozilla	140.16 through 140.Not affected 153.3 through 153.Not affected 156 and laterNot affected

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2060488
https://www.mozilla.org/security/advisories/mfsa2026-94/
https://www.mozilla.org/security/advisories/mfsa2026-95/
https://www.mozilla.org/security/advisories/mfsa2026-96/

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