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mutt before 2.3.2 has an infinite loop in data_object_to_stream in crypt-gpgme.c. (CVE-2026-43863)

0
Medium
VulnerabilityCVE-2026-43863gcveosvubuntu-cve-2026-43863cve-2026-43863ubuntu-pro-16-04-ltsubuntu-pro-18-04-ltsubuntu-20-04-ltsubuntu-22-04-ltsubuntu-24-04-ltsubuntu-25-10ubuntu-26-10ubuntu-26-04-lts
Published: 05/04/2026 (05/04/2026, 07:16:00 UTC)
Source: GCVE Database
Product: mutt

Description

Mutt versions before 2.3.2 contain an infinite loop vulnerability in the data_object_to_stream function within crypt-gpgme.c. This flaw can cause the application to hang or become unresponsive. The vulnerability has a medium severity rating with a CVSS score of 3.7.

CVSS v3.1

Score 3.7low

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected software

Ubuntu:Pro:16.04:LTSmore threats →ghsa
mutt
pkg:deb/ubuntu/mutt?arch=source&distro=esm-infra/xenial
Affected versions
=1.5.23-3.1ubuntu1=1.5.23-3.1ubuntu2=1.5.24-1=1.5.24-1build1=1.5.24-1ubuntu0.1=1.5.24-1ubuntu0.2=1.5.24-1ubuntu0.3=1.5.24-1ubuntu0.4=1.5.24-1ubuntu0.5=1.5.24-1ubuntu0.6=1.5.24-1ubuntu0.6+esm2=1.5.24-1ubuntu0.6+esm3
Ubuntu:Pro:18.04:LTSmore threats →ghsa
mutt
pkg:deb/ubuntu/mutt?arch=source&distro=esm-infra/bionic
Affected versions
=1.8.3+neomutt20170609-2build1=1.9.1-2=1.9.1-3=1.9.1-4=1.9.1-5=1.9.2-1=1.9.3-1=1.9.4-2=1.9.4-3=1.9.4-3ubuntu0.1=1.9.4-3ubuntu0.2=1.9.4-3ubuntu0.3=1.9.4-3ubuntu0.4=1.9.4-3ubuntu0.5=1.9.4-3ubuntu0.6=1.9.4-3ubuntu0.6+esm1
Ubuntu:20.04:LTSmore threats →ghsa
mutt
pkg:deb/ubuntu/mutt?arch=source&distro=focal
Affected versions
=1.10.1-2.1=1.12.2-1=1.12.2-2=1.13.0-1=1.13.2-1=1.13.2-1ubuntu0.1=1.13.2-1ubuntu0.2=1.13.2-1ubuntu0.3=1.13.2-1ubuntu0.4=1.13.2-1ubuntu0.5=1.13.2-1ubuntu0.6
Ubuntu:22.04:LTSmore threats →ghsa
mutt
pkg:deb/ubuntu/mutt?arch=source&distro=jammy
Affected versions
=2.0.5-4.1build1=2.1.3-1=2.1.4-1=2.1.4-1build1=2.1.4-1ubuntu1.1=2.1.4-1ubuntu1.2
Ubuntu:24.04:LTSmore threats →ghsa
mutt
pkg:deb/ubuntu/mutt?arch=source&distro=noble
Affected versions
=2.2.9-1=2.2.9-1ubuntu0.23.10.1=2.2.12-0.1=2.2.12-0.1build2=2.2.12-0.1build3=2.2.12-0.1build4
Ubuntu:25.10more threats →ghsa
mutt
pkg:deb/ubuntu/mutt?arch=source&distro=questing
Affected versions
=2.2.13-1
Ubuntu:26.10more threats →ghsa
mutt
pkg:deb/ubuntu/mutt?arch=source&distro=stonking
Affected versions
=2.2.13-1build2=2.3.2-1=2.4.0-1=2.4.1-1
Ubuntu:26.04:LTSmore threats →ghsa
mutt
pkg:deb/ubuntu/mutt?arch=source&distro=resolute
Affected versions
=2.2.13-1=2.2.13-1build1=2.2.13-1build2

Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.

AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 10/18/2026, 01:36:50 UTC

Technical Analysis

The vulnerability identified as CVE-2026-43863 affects mutt versions prior to 2.3.2. It involves an infinite loop in the data_object_to_stream function located in the crypt-gpgme.c source file. This defect can lead to a denial of service condition by causing the application to enter an endless loop, impacting availability. The CVSS 3.1 vector indicates network attack vector, high attack complexity, no privileges required, no user interaction, unchanged scope, no confidentiality or integrity impact, and low impact on availability.

Potential Impact

Successful exploitation results in a denial of service due to an infinite loop, causing the mutt application to hang or become unresponsive. There is no impact on confidentiality or integrity.

Mitigation Recommendations

A fix is available in mutt version 2.3.2 and later. Users should upgrade to version 2.3.2 or newer to remediate this vulnerability. No additional mitigation steps are indicated.

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Technical Details

Gcve Source
db.gcve.eu
Osv Id
UBUNTU-CVE-2026-43863
Osv Schema Version
1.7.0
Ecosystems
["Ubuntu:Pro:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:25.10","Ubuntu:26.10","Ubuntu:26.04:LTS"]
Cvss Version
3.1

Threat ID: 6ad3f67b2cdf04f6566668f5

Added to database: 10/17/2026, 22:28:11 UTC

Last enriched: 10/18/2026, 01:36:50 UTC

Last updated: 10/18/2026, 01:36:50 UTC

Views: 4

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