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Description

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 Reserved 2026-02-13 | Published 2026-03-16 | Updated 2026-03-17 | Assigner Mattermost




MEDIUM: 5.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L

Problem types

CWE-1287: Improper Validation of Specified Type of Input

Product status

Default status
unaffected

11.3.0 (semver)
affected

11.2.0 (semver)
affected

10.11.0 (semver)
affected

11.4.0
unaffected

11.3.1
unaffected

11.2.3
unaffected

10.11.11
unaffected

Credits

National Security Agency finder

References

mattermost.com/security-updates (MMSA-2025-00537) vendor-advisory

cve.org (CVE-2026-2454)

nvd.nist.gov (CVE-2026-2454)

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