GHSA-9r42-rhw3-2222

Suggest an improvement
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.osv.dev/v1/vulns/GHSA-9r42-rhw3-2222
Aliases
Published
2026-01-16T09:31:21Z
Modified
2026-01-16T21:26:17.813115Z
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"
    ],
    "severity": "LOW",
    "nvd_published_at": "2026-01-16T09:16:01Z",
    "github_reviewed": true,
    "github_reviewed_at": "2026-01-16T20:54:02Z"
}
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

source

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

last_known_affected_version_range

"<= 10.11.8"

github.com/mattermost/mattermost/server/v8

Package

Name
github.com/mattermost/mattermost/server/v8
View open source insights on deps.dev
Purl
pkg:golang/github.com/mattermost/mattermost/server/v8

Affected ranges

Type
SEMVER
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
8.0.0-20251201064648-4d86263f5430

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"

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"