CVE-2026-84639

CRITICAL9.1

Published 2026-09-01 · Updated 2026-09-02 · Source security@mozilla.org

Description

Triggering an error condition in certain MIME bodies would cause uninitialized memory to be used. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.

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

CWE-457

References

View on NVD

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