GHSA-9r42-rhw3-2222

Source

https://github.com/advisories/GHSA-9r42-rhw3-2222

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/01/GHSA-9r42-rhw3-2222/GHSA-9r42-rhw3-2222.json

JSON Data

https://api.test.osv.dev/v1/vulns/GHSA-9r42-rhw3-2222

Aliases

Published

2026-01-16T09:31:21Z

Modified

2026-03-19T08:47:31Z

Severity

3.1 (Low) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L CVSS Calculator

Summary

Mattermost is vulnerable to CPU exhaustion via crafted HTTP request

Details

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.

Database specific

{
    "cwe_ids":  [
        "CWE-407",
        "CWE-770"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-01-16T20:54:02Z",
    "nvd_published_at":  "2026-01-16T09:16:01Z",
    "severity":  "LOW"
}

References

Affected packages

Go / github.com/mattermost/mattermost-server

Package

Name: github.com/mattermost/mattermost-server; View open source insights on deps.dev
Purl: pkg:golang/github.com/mattermost/mattermost-server

Affected ranges

Type: SEMVER
Events: Introduced

10.11.0

Fixed

10.11.9

Database specific

last_known_affected_version_range

"<= 10.11.8"

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/01/GHSA-9r42-rhw3-2222/GHSA-9r42-rhw3-2222.json"

Go / github.com/mattermost/mattermost-server

Package

Name: github.com/mattermost/mattermost-server; View open source insights on deps.dev
Purl: pkg:golang/github.com/mattermost/mattermost-server

Affected ranges

Type: SEMVER
Events: Introduced

11.0.0

Fixed

11.2.0

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/01/GHSA-9r42-rhw3-2222/GHSA-9r42-rhw3-2222.json"