How severe is CVE-2026-43860?

CVE-2026-43860 has a CVSS 3.x base score of 3.7, rated low severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2026-43860 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-43860?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-43860 have an EU (EUVD) identifier?

Yes. CVE-2026-43860 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-26896.

When was CVE-2026-43860 published?

CVE-2026-43860 was published on 2026-05-04 and last updated on 2026-06-17.

CVE-2026-43860

CVE-2026-43860 is a low-severity vulnerability with a CVSS 3.x base score of 3.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-193.

Key facts

Severity: Low (CVSS 3.x base score 3.7)
EPSS exploit prediction: 0% (6th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-26896
Weakness: CWE-193
Published: 2026-05-04
Last modified: 2026-06-17

Description

mutt before 2.3.2 sometimes truncates the hash_passwd by one byte for IMAP auth_cram MD5 digest.

Frequently asked questions

What is CVE-2026-43860?: mutt before 2.3.2 sometimes truncates the hash_passwd by one byte for IMAP auth_cram MD5 digest.
How severe is CVE-2026-43860?: CVE-2026-43860 has a CVSS 3.x base score of 3.7, rated low severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2026-43860 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-43860?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-43860 have an EU (EUVD) identifier?: Yes. CVE-2026-43860 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-26896.
When was CVE-2026-43860 published?: CVE-2026-43860 was published on 2026-05-04 and last updated on 2026-06-17.

References

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

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