Is CVE-2026-43863 in the CISA KEV catalog?

No. CVE-2026-43863 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-43863?

CVE-2026-43863 has a CVSS v3 base score of 3.7 (LOW).

What is the EPSS score for CVE-2026-43863?

CVE-2026-43863 has an EPSS score of 0.20% (10th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-43863?

Upgrade mutt on debian unstable to 2.3.2-1 or later.

CVE & CISA-KEV Catalog

CVE-2026-43863

LOW

3.7

CVSS v3

NVD

Description

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

CWE-253

How to fix

Remediation Available

muttDebian

Fixed in:2.3.2-1CVE-2026-43863

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityLow

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

Exploit Intelligence

0.20%probability of exploitation in 30 days

10thpercentile

Low risk: more likely to be exploited than 10% of all known CVEs.

References

Other references1

github.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-05.