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Untriaged
Permalink CVE-2026-2454
5.8 MEDIUM
  • CVSS version: 3.1
  • Attack vector (AV): NETWORK
  • Attack complexity (AC): LOW
  • Privileges required (PR): NONE
  • User interaction (UI): NONE
  • Scope (S): CHANGED
  • Confidentiality impact (C): NONE
  • Integrity impact (I): NONE
  • Availability impact (A): LOW
created 1 month ago
DoS in Calls plugin via malformed msgpack in websocket request.

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

Affected products

Mattermost
  • ==11.2.3
  • ==10.11.11
  • =<11.3.0
  • ==11.3.1
  • =<10.11.10
  • ==11.4.0
  • =<11.2.2

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