CVE-2026-43859

Name: CVE-2026-43859
Creator: NVD / NIST
Published: 2026-05-04T07:16:00.4+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

LOWCVSS 3.7/10EPSS 0.16%

Last modified Jun 17, 2026

CVE-2026-43859 is a low-severity vulnerability rated 3.7/10 on the CVSS scale. mutt before 2.3.2 sometimes uses strfcpy instead of memcpy for the IMAP auth_cram MD5 digest.. EPSS estimates a 0.16% chance of exploitation in the next 30 days.

Description

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

Metrics

CVSS 3.1

3.7/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

EPSS Probability

0.16%

5.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-158

References

https://github.com/muttmua/mutt/commit/834c5a2ed0479e51e8662a31caed129f136f4805

Timeline

Published: May 4, 2026
Last Modified: Jun 17, 2026
Status: Deferred

Frequently Asked Questions

What is CVE-2026-43859?

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

How severe is CVE-2026-43859?

CVE-2026-43859 has a CVSS score of 3.7/10 (LOW severity). The EPSS model estimates a 0.16% probability of exploitation in the next 30 days.

How do I fix CVE-2026-43859?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-43859?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST