Vulnerability in Mutt

CVE-2026-43861

mutt before 2.3.2 does not check for '\0' in url_pct_decode.

Published · last modified .

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.

EPSS exploit prediction

EPSS: 0.003 (16.0th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 16th percentile — 16.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-43861: held from 0.002 to 0.003.

EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-43861?
CVE-2026-43861 is a low-severity vulnerability in Mutt, classified under CWE-158. CVSS score: 3.7/10. Published 2026-05-04.
How severe is CVE-2026-43861?
Low severity. CVSS v3 base score is 3.7 out of 10.