CVE-2026-43864

Name of the Vulnerable Software and Affected Versions mutt versions prior to 2.3.2

Description A NULL pointer dereference exists in the show sig summary function. A NULL pointer dereference occurs when a program attempts to read or write to a memory location using a pointer that is null, typically leading to a program crash.

Recommendations Update to version 2.3.2 or later. As a temporary workaround, consider disabling the show sig summary function until the update is applied.