CVE-2026-92239

high

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.

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-2026-79243

https://bugzilla.mozilla.org/show_bug.cgi?id=2060488

Details

Source: Mitre, NVD

Published: 2026-09-15

Updated: 2026-09-24

Risk Information

CVSS v2

Base Score: 9.4

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

Severity: High

CVSS v3

Base Score: 8.1

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