CVE-2026-43859: Mutt

Low severity, CVSS 3.7. EPSS: 0.3% chance of exploitation in the next 30 days.

mutt before 2.3.2 sometimes uses strfcpy instead of memcpy for the IMAP auth_cram MD5 digest.

Affected products

• Mutt Mutt: before 2.3.2 (fixed in 2.3.2)

Published 2026-05-04. Last modified 2026-06-17.