CVE-2026-43864: Mutt

Low severity, CVSS 2.5. EPSS: 0.1% chance of exploitation in the next 30 days.

mutt before 2.3.2 has a show_sig_summary NULL pointer dereference.

Affected products

• Mutt Mutt: before 2.3.2 (fixed in 2.3.2)

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