Low severityOSV Advisory· Published Jan 16, 2026· Updated Jan 16, 2026
DoS from quadratic complexity in model.ParseHashtags
CVE-2025-14822
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
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/mattermost/mattermost-serverGo | >= 10.11.0, < 10.11.9 | 10.11.9 |
github.com/mattermost/mattermost-serverGo | >= 11.0.0, < 11.2.0 | 11.2.0 |
Affected products
3- Range: @mattermost/client@10.11.0, @mattermost/types@10.11.0, mattermost-redux@10.11.0, …
- ghsa-coords2 versionspkg:golang/github.com/mattermost/mattermost-serverpkg:rpm/opensuse/govulncheck-vulndb&distro=openSUSE%20Leap%2015.6
>= 10.11.0, < 10.11.9+ 1 more
- (no CPE)range: >= 10.11.0, < 10.11.9
- (no CPE)range: < 0.0.20260226T182644-150000.1.149.1
Patches
Vulnerability mechanics
References
6- github.com/advisories/GHSA-9r42-rhw3-2222ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2025-14822ghsaADVISORY
- github.com/mattermost/mattermost/commit/4d86263f5430d0eb991fc52ec886cf778cb072e6ghsaWEB
- github.com/mattermost/mattermost/commit/b3d6c0c564c1a79e54e5105d0a8b60fc58a2bdeeghsaWEB
- mattermost.com/security-updatesghsaWEB
- pkg.go.dev/vuln/GO-2026-4325ghsaWEB
News mentions
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