mutt up to 2.3.1 crypt-gpgme.c data_object_to_stream function return value

CVSS Meta Temp Score
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CTI Interest Score
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3.3$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic has been found in mutt up to 2.3.1. This issue affects the function data_object_to_stream of the file crypt-gpgme.c. The manipulation leads to function return value. This vulnerability is uniquely identified as CVE-2026-43863. The attack is possible to be carried out remotely. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in mutt up to 2.3.1. This issue affects the function data_object_to_stream of the file crypt-gpgme.c. The manipulation with an unknown input leads to a function return value vulnerability. Using CWE to declare the problem leads to CWE-253. The product incorrectly checks a return value from a function, which prevents it from detecting errors or exceptional conditions. Impacted is availability. The summary by CVE is:

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

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-43863 since 05/04/2026. The exploitation is known to be difficult. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 321070 (SUSE SLES12 Security Update : mutt (SUSE-SU-2026:2300-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 2.3.2 eliminates this vulnerability. Applying the patch fdc04a171777327218a1e78db504926c388b48c4 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (321070) and CERT Bund (WID-SEC-2026-1343). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

  • Open Source mutt

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.4
VulDB Meta Temp Score: 3.3

VulDB Base Score: 3.1
VulDB Temp Score: 3.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 3.7
CNA Vector (MITRE): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Function return value
CWE: CWE-253
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 321070
Nessus Name: SUSE SLES12 Security Update : mutt (SUSE-SU-2026:2300-1)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: mutt 2.3.2
Patch: fdc04a171777327218a1e78db504926c388b48c4

Timelineinfo

05/04/2026 Advisory disclosed
05/04/2026 +0 days CVE reserved
05/04/2026 +0 days VulDB entry created
06/14/2026 +41 days VulDB entry last update

Sourcesinfo

Advisory: fdc04a171777327218a1e78db504926c388b48c4
Status: Confirmed

CVE: CVE-2026-43863 (🔒)
GCVE (CVE): GCVE-0-2026-43863
GCVE (VulDB): GCVE-100-360947
CERT Bund: WID-SEC-2026-1343 - mutt: Mehrere Schwachstellen

Entryinfo

Created: 05/04/2026 09:21
Updated: 06/14/2026 21:39
Changes: 05/04/2026 09:21 (67), 05/04/2026 12:54 (7), 06/14/2026 21:39 (2)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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