What is GHSA-9r42-rhw3-2222?

GHSA-9r42-rhw3-2222 is a security advisory published by GitHub Security Advisories with Low severity. Mattermost is vulnerable to CPU exhaustion via crafted HTTP request

Which CVE IDs does GHSA-9r42-rhw3-2222 cover?

GHSA-9r42-rhw3-2222 covers the following CVE IDs: CVE-2025-14822. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-9r42-rhw3-2222?

GHSA-9r42-rhw3-2222 has a CVSS v3 base score of 3.1, published by GitHub Security Advisories.

Which products are affected by GHSA-9r42-rhw3-2222?

GHSA-9r42-rhw3-2222 affects 2 products, including: go/github.com/mattermost/mattermost-server:\u003e= 10.11.0, \u003c= 10.11.8; go/github.com/mattermost/mattermost-server:\u003e= 11.0.0, \u003c 11.2.0.

GHSA-9r42-rhw3-2222LowCVSS 3.1

Mattermost is vulnerable to CPU exhaustion via crafted HTTP request

Vendor

GitHub Security Advisories

Published

January 16, 2026

Last Modified

February 27, 2026

🔗 CVE IDs covered (1)

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.

🎯 Affected products2

go/github.com/mattermost/mattermost-server:>= 10.11.0, <= 10.11.8
go/github.com/mattermost/mattermost-server:>= 11.0.0, < 11.2.0

🔗 References (6)

https://nvd.nist.gov/vuln/detail/CVE-2025-14822
https://mattermost.com/security-updates
https://github.com/mattermost/mattermost/commit/4d86263f5430d0eb991fc52ec886cf778cb072e6
https://github.com/mattermost/mattermost/commit/b3d6c0c564c1a79e54e5105d0a8b60fc58a2bdee
https://pkg.go.dev/vuln/GO-2026-4325
https://github.com/advisories/GHSA-9r42-rhw3-2222