Home

Description

Mattermost versions 10.11.x <= 10.11.8 fail to validate input size before processing hashtags which allows an authenticated attacker to exhaust CPU resources via a single HTTP request containing a post with thousands space-separated tokens

PUBLISHED Reserved 2025-12-17 | Published 2026-01-16 | Updated 2026-01-16 | Assigner Mattermost




LOW: 3.1CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L

Problem types

CWE-407: Inefficient Algorithmic Complexity

Product status

Default status
unaffected

10.11.0 (semver)
affected

11.2.0
unaffected

10.11.9
unaffected

Credits

CatenaCyber finder

References

mattermost.com/security-updates

cve.org (CVE-2025-14822)

nvd.nist.gov (CVE-2025-14822)

Download JSON