Copyright © 2012 Red Hat, Inc. All rights reserved. Moderate 2026-05-04T06:10:52 mutt: Mutt: Denial of Service via null pointer dereference in show_sig_summary 4.7 CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H CWE-476

A flaw was found in mutt. This vulnerability, a null pointer dereference in the `show_sig_summary` function, could allow an attacker to cause a denial of service. This occurs when processing specially crafted input related to signature summaries.

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability. Red Hat Enterprise Linux 10 Fix deferred mutt Red Hat Enterprise Linux 6 Fix deferred mutt Red Hat Enterprise Linux 7 Fix deferred mutt Red Hat Enterprise Linux 8 Fix deferred mutt Red Hat Enterprise Linux 9 Fix deferred mutt https://www.cve.org/CVERecord?id=CVE-2026-43864 https://nvd.nist.gov/vuln/detail/CVE-2026-43864 https://github.com/muttmua/mutt/commit/ebfa2969042d89303d15334193fcc32866c8a8df