GitHub Advisoryadvisory · Go

GHSA-9r42-rhw3-2222 Mattermost is vulnerable to CPU exhaustion via crafted HTTP request

LOW Published 2026-01-16 Modified 2026-02-27 Official page ↗
Aliases
CVE-2025-14822
Ecosystem
Go
Packages
github.com/mattermost/mattermost-server
Severity
Low
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
Weaknesses
CWE-407, CWE-770
Reviewed
2026-01-16

Affected packages

• Go github.com/mattermost/mattermost-server: >= 10.11.0, < 10.11.9 → fixed in 10.11.9 • Go github.com/mattermost/mattermost-server: >= 11.0.0, < 11.2.0 → fixed in 11.2.0

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.

Related

Alias · CVE (1)

  • CVE-2025-14822 Mattermost versions 10.11.x <= 10.11.8 fail to validate input size before processing hashtags which allows an authenticated attacker to… vulnerability

Weakness · CWE (2)

  • CWE-407 Inefficient Algorithmic Complexity weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling weakness

References