Vulnerability · Published May 4, 2026 · Assigned by mitre
CVE-2026-43864
Low 2.5
In plain English
A low-severity null pointer dereference in mutt from mutt. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 1% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)2.5Low
Exploit odds (30 days)<0.1%top 99.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
mutt before 2.3.2 has a show_sig_summary NULL pointer dereference.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | mutt | no fix listed | DEBIAN-CVE-2026-43864 |
| Debian:13 | mutt | 2.2.13-1+deb13u1 | DEBIAN-CVE-2026-43864 |
| Debian:14 | mutt | 2.3.2-1 | DEBIAN-CVE-2026-43864 |
| Ubuntu:22.04:LTS | mutt | no fix listed | UBUNTU-CVE-2026-43864 |
| Ubuntu:24.04:LTS | mutt | no fix listed | UBUNTU-CVE-2026-43864 |
| Ubuntu:25.10 | mutt | no fix listed | UBUNTU-CVE-2026-43864 |
| Ubuntu:26.04:LTS | mutt | no fix listed | UBUNTU-CVE-2026-43864 |
| Ubuntu:26.10 | mutt | no fix listed | UBUNTU-CVE-2026-43864 |
Affected products (as reported)
Weakness: CWE-476 · Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L