PT-2026-36777 · Mutt · Mutt

Evilrabbit · Published 2026-05-04 · Updated 2026-05-09 · CVE-2026-43864

Positive Technologies (AI Summary)

CVSS v3.1

2.5

Low

Base vector

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

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.

Fix

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

CVE-2026-43864

OESA-2026-2200

Affected Products

Mutt

References · 15

• https://nvd.nist.gov/vuln/detail/CVE-2026-43862 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-43863 · Security Note
• https://osv.dev/vulnerability/OESA-2026-2200 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-43864 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-43864 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-43864 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-43859 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-43860 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-43861 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-43864 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-43864 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2026-43864 · Vendor Advisory
• https://github.com/muttmua/mutt/commit/ebfa2969042d89303d15334193fcc32866c8a8df · Note
• https://twitter.com/vuldb/status/2051394581279994169 · Twitter Post
• https://openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2200 · Note