How severe is CVE-2026-43862?

CVE-2026-43862 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-2026-43862 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-2026-43862?

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

Does CVE-2026-43862 have an EU (EUVD) identifier?

Yes. CVE-2026-43862 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-26900.

When was CVE-2026-43862 published?

CVE-2026-43862 was published on 2026-05-04 and last updated on 2026-06-17.

CVE-2026-43862

CVE-2026-43862 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-843.

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-2026-26900
Weakness: CWE-843
Published: 2026-05-04
Last modified: 2026-06-17

Description

In mutt before 2.3.2, the imap_auth_gss security level is mishandled.

Frequently asked questions

What is CVE-2026-43862?: In mutt before 2.3.2, the imap_auth_gss security level is mishandled.
How severe is CVE-2026-43862?: CVE-2026-43862 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-2026-43862 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-2026-43862?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-43862 have an EU (EUVD) identifier?: Yes. CVE-2026-43862 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-26900.
When was CVE-2026-43862 published?: CVE-2026-43862 was published on 2026-05-04 and last updated on 2026-06-17.

References

https://github.com/muttmua/mutt/commit/f547a849cdacb512800a5f477c27de217e1c8151

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