CVE-2026-2454
DoS in Calls plugin via malformed msgpack in websocket request.
CVSS Score
5.8
EPSS Score
0.0%
EPSS Percentile
0th
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
| CWE | CWE-1287 |
| Vendor | mattermost |
| Product | mattermost |
| Published | Mar 16, 2026 |
| Last Updated | Mar 17, 2026 |
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CVSS v3 Breakdown
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
Affected Versions
Mattermost / Mattermost
11.3.0 ≤ 11.3.0 11.2.0 ≤ 11.2.2 10.11.0 ≤ 10.11.10
Credits
National Security Agency