CVE-2026-2454

Published: Mar 16, 2026

Modified: Mar 17, 2026

PUBLISHED

CVSS v3.1

5.8

MEDIUM

Description

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to handle incorrectly reported array lengths which allows malicious user to cause OOM errors and crash the server via sending corrupted msgpack frames within websocket messages to calls plugin. Mattermost Advisory ID: MMSA-2025-00537

Vendor	Product	Versions
Mattermost	Mattermost	affected `11.3.0 - <= 11.3.0` affected `11.2.0 - <= 11.2.2` affected `10.11.0 - <= 10.11.10` unaffected `11.4.0` unaffected `11.3.1` +2 more versions

Weaknesses (CWE)

CWE-1287

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

None

Availability

Low

References

MMSA-2025-00537

vendor-advisory

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CVE-2026-2454

Description

Affected Products

Weaknesses (CWE)

CVSS v3.1 Details

References