CVE-2026-92238

critical

Description

A maliciously constructed mail header could lead to multiple fields being parsed as one, or potential memory safety violations. This vulnerability was fixed in Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.

References

https://www.mozilla.org/security/advisories/mfsa2026-96/

https://www.mozilla.org/security/advisories/mfsa2026-95/

https://www.mozilla.org/security/advisories/mfsa2026-94/

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-79242

https://bugzilla.mozilla.org/show_bug.cgi?id=2060601

Details

Source: Mitre, NVD

Published: 2026-09-15

Updated: 2026-09-24

Risk Information

CVSS v2

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Severity: Critical

CVSS v3

Base Score: 9.8

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H