CVE-2026-2454

Fixed in a distro release EPSS <1%CVSS 5.8

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

Published 2026-03-16 · CVE record · OSV

Products: Mattermost

Distro releases