CVE-2025-14822: Mattermost is vulnerable to CPU exhaustion via crafted HTTP request
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.
References
- github.com/advisories/GHSA-9r42-rhw3-2222
- github.com/mattermost/mattermost
- github.com/mattermost/mattermost/commit/4d86263f5430d0eb991fc52ec886cf778cb072e6
- github.com/mattermost/mattermost/commit/b3d6c0c564c1a79e54e5105d0a8b60fc58a2bdee
- mattermost.com/security-updates
- nvd.nist.gov/vuln/detail/CVE-2025-14822
Code Behaviors & Features
Detect and mitigate CVE-2025-14822 with GitLab Dependency Scanning
Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Dependency Scanning using SBOM also detects vulnerabilities from proprietary advisories that this site does not include. Learn more about Dependency Scanning using SBOM →