Vulnerability · Published May 4, 2026 · Assigned by mitre
CVE-2026-43859
Low 3.7
In plain English
A low-severity security flaw 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 0.2% (higher than 5% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)3.7Low
Exploit odds (30 days)0.2%top 94.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
mutt before 2.3.2 sometimes uses strfcpy instead of memcpy for the IMAP auth_cram MD5 digest.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | mutt | no fix listed | DEBIAN-CVE-2026-43859 |
| Debian:13 | mutt | 2.2.13-1+deb13u1 | DEBIAN-CVE-2026-43859 |
| Debian:14 | mutt | 2.3.2-1 | DEBIAN-CVE-2026-43859 |
| Ubuntu:22.04:LTS | mutt | no fix listed | UBUNTU-CVE-2026-43859 |
| Ubuntu:24.04:LTS | mutt | no fix listed | UBUNTU-CVE-2026-43859 |
| Ubuntu:25.10 | mutt | no fix listed | UBUNTU-CVE-2026-43859 |
| Ubuntu:26.04:LTS | mutt | no fix listed | UBUNTU-CVE-2026-43859 |
| Ubuntu:26.10 | mutt | no fix listed | UBUNTU-CVE-2026-43859 |
Affected products (as reported)
Weakness: CWE-158 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N