CVE-2026-84640

Description

A maliciously constructed mail header could lead to a one byte read past the end of a buffer. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.

References

https://www.mozilla.org/security/advisories/mfsa2026-88/

https://www.mozilla.org/security/advisories/mfsa2026-87/

https://www.mozilla.org/security/advisories/mfsa2026-86/

https://bugzilla.mozilla.org/show_bug.cgi?id=2063964

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

EPSS