NULL pointer dereference in Mutt

CVE-2026-43864

mutt before 2.3.2 has a show_sig_summary NULL pointer dereference.

EPSS: 0.000 (2.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 2.5 (Low). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L.

Affected products

Mutt — versions 0

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

cve@mitre.org

Frequently asked questions

What is CVE-2026-43864?: CVE-2026-43864 is a low-severity vulnerability in Mutt, classified under NULL Pointer Dereference. CVSS score: 2.5/10. Published 2026-05-04.
How severe is CVE-2026-43864?: Low severity. CVSS v3 base score is 2.5 out of 10.