CVE-2026-92238

Critical CVSS 9.8

Published 2026-09-15 · last changed 2026-09-24

The fix

We hold no Microsoft remediation data for CVE-2026-92238, which normally means it is not a Windows CVE. For non-Microsoft software the fix is the vendor's own updated release, and the affected versions are listed below.

What it is

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.

Sources

NVD record for CVE-2026-92238

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