Unrated
DoS in Calls plugin via malformed msgpack in websocket request.
CVE-2026-2454
First seen on SecPulse
Original description The description as published by the source.
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
References
- advisory github.com
- advisory mattermost.com
- advisory nvd.nist.gov