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CVE-2026-93849

6.5 medium SSVC exploitation: none Published
NVD · CVE.org

Mattermost versions 11.9.x <= 11.9.1, 11.8.x <= 11.8.5, 11.7.x <= 11.7.10, 11.10.x <= 11.10.1 Mattermost fail to apply allocation limits to the byte-string decode paths in its WebSocket msgpack decoder, which allows an authenticated remote attacker to cause excessive server memory allocation via a crafted binary WebSocket frame declaring a Bin32 payload length of up to 4,294,967,295 bytes.. Mattermost Advisory ID: MMSA-2026-00768

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 4

  1. StatusAwaiting Analysis → PublishedNVD modified 2026-10-26 16:46
  2. StatusPublished → Awaiting AnalysisNVD modified 2026-10-26 17:17
  3. StatusReceived → PublishedNVD modified 2026-10-26 14:25
  4. First seenCVSS 6.5NVD modified 2026-10-26 15:16

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 1