Vulnerability in Mutt

CVE-2026-43859

mutt before 2.3.2 sometimes uses strfcpy instead of memcpy for the IMAP auth_cram MD5 digest.

EPSS: 0.000 (11.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N.

Affected products

Mutt — versions 0

Weakness classification (CWE)

CWE-158

References

cve@mitre.org

Frequently asked questions

What is CVE-2026-43859?: CVE-2026-43859 is a low-severity vulnerability in Mutt, classified under CWE-158. CVSS score: 3.7/10. Published 2026-05-04.
How severe is CVE-2026-43859?: Low severity. CVSS v3 base score is 3.7 out of 10.