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:2.2.13-1+deb13u1CVE-2026-43863

Fixed in:2.3.2-1CVE-2026-43863

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

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

Related Vulnerabilities

Other CWE-253 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-49286	High	8.6	10%	-	Fix
CVE-2017-7474	Critical	9.8	2.5%	-	-
CVE-2024-43521	High	7.5	2.4%	-	Fix
CVE-2020-6107	Medium	5.5	1.5%	-	Fix
CVE-2022-24880	Medium	5.3	1.2%	-	Fix
CVE-2023-24487	Medium	6.3	1.1%	-	Fix

Common questions

How do I fix CVE-2026-43863?

Upgrade mutt on debian 13 to 2.2.13-1+deb13u1 or later.

Is CVE-2026-43863 being actively exploited?

Not that we know of. CVE-2026-43863 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.20% is the estimated probability that it will be exploited in the next 30 days. That is higher than 10% of all scored CVEs.

How severe is CVE-2026-43863?

CVE-2026-43863 has a CVSS v3 base score of 3.7, rated low. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-43863 affect?

Published advisories record a fix for mutt (Debian). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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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.