CVE-2026-92239

High CVSS 8.1

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

The fix

We hold no Microsoft remediation data for CVE-2026-92239, 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 IMAP line could cause an out-of-bounds buffer read. This vulnerability was fixed in Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.

Sources

NVD record for CVE-2026-92239

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