VDB-360946 · CVE-2026-43862 · Nessus 321070

mutt up to 2.3.1 imap_auth_gss type confusion

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
4.3	$0-$5k	0.00

Summaryinfo

A vulnerability described as problematic has been identified in mutt up to 2.3.1. This vulnerability affects the function imap_auth_gss. Executing a manipulation can lead to type confusion. This vulnerability is handled as CVE-2026-43862. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as problematic was found in mutt up to 2.3.1. This vulnerability affects the function imap_auth_gss. The manipulation with an unknown input leads to a type confusion vulnerability. The CWE definition for the vulnerability is CWE-843. The product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

In mutt before 2.3.2, the imap_auth_gss security level is mishandled.

The advisory is available at github.com. This vulnerability was named CVE-2026-43862 since 05/04/2026. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. Technical details 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.

The vulnerability is also documented in the databases at Tenable (321070) and CERT Bund (WID-SEC-2026-1343). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

Open Source mutt

Productinfo

Type

Mail Client Software

Name

mutt

Version

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.3

VulDB Base Score: 5.0
VulDB Temp Score: 4.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

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

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

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

Exploitinginfo

Class: Type confusion
CWE: CWE-843
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

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

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: f547a849cdacb512800a5f477c27de217e1c8151
Status: Confirmed

CVE: CVE-2026-43862 (🔒)
GCVE (CVE): GCVE-0-2026-43862
GCVE (VulDB): GCVE-100-360946
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 (64), 05/04/2026 12:54 (7), 06/14/2026 21:39 (2)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.