How severe is CVE-2026-43863?

CVE-2026-43863 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 none, and availability low.

Is CVE-2026-43863 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-43863?

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

Does CVE-2026-43863 have an EU (EUVD) identifier?

Yes. CVE-2026-43863 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-26902.

When was CVE-2026-43863 published?

CVE-2026-43863 was published on 2026-05-04 and last updated on 2026-06-17.

CVE-2026-43863

CVE-2026-43863 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-253.

Key facts

Severity: Low (CVSS 3.x base score 3.7)
EPSS exploit prediction: 0% (10th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-26902
Weakness: CWE-253
Published: 2026-05-04
Last modified: 2026-06-17

Description

mutt before 2.3.2 has an infinite loop in data_object_to_stream in crypt-gpgme.c.

Frequently asked questions

What is CVE-2026-43863?: mutt before 2.3.2 has an infinite loop in data_object_to_stream in crypt-gpgme.c.
How severe is CVE-2026-43863?: CVE-2026-43863 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 none, and availability low.
Is CVE-2026-43863 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-43863?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-43863 have an EU (EUVD) identifier?: Yes. CVE-2026-43863 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-26902.
When was CVE-2026-43863 published?: CVE-2026-43863 was published on 2026-05-04 and last updated on 2026-06-17.

References

https://github.com/muttmua/mutt/commit/fdc04a171777327218a1e78db504926c388b48c4

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