Bug 2448240 (CVE-2026-2454) - CVE-2026-2454 github.com/mattermost/mattermost-server/: DoS in Calls plugin via malformed msgpack in websocket request.
Summary: CVE-2026-2454 github.com/mattermost/mattermost-server/: DoS in Calls plugin v...
Keywords:
Status: NEW
Alias: CVE-2026-2454
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2448272 2448273
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-03-16 21:03 UTC by OSIDB Bzimport
Modified: 2026-03-16 22:26 UTC (History)
0 users

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Description OSIDB Bzimport 2026-03-16 21:03:13 UTC 
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
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