GHSA-9r42-rhw3-2222: github.com/mattermost/mattermost-server fixed in 11.2.0 and 10.11.9

GHSA-9r42-rhw3-2222 PUBLISHED CVSS 3.0999999046325684 LOW

Mattermost is vulnerable to CPU exhaustion via crafted HTTP request

Record from GitHub Advisory Database · Published January 16, 2026

github.com/mattermost/mattermost-server is fixed in 11.2.0 and 10.11.9 (Go Modules)

Mattermost is vulnerable to CPU exhaustion via crafted HTTP request

Fixed versions

Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.

Package	Ecosystem	Fixed in
github.com/mattermost/mattermost-server	Go Modules	11.2.0, 10.11.9

Risk scores

CVSS 3.1

3.0999999046325684

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L

Affected products

Vendor	Product	Versions
github.com	mattermost/mattermost-server	10.11.0, 11.0.0

Timeline

Jan 16, 2026 CVE Published
Apr 29, 2026 Security Advisory

Query this with the API

The same record, from the CLI:

vulnetix vdb vuln GHSA-9r42-rhw3-2222
vulnetix vdb fixes GHSA-9r42-rhw3-2222

Or with curl, using the org id and key from your account page:

curl -s -H "Authorization: ApiKey ${VULNETIX_ORG_ID}:${VULNETIX_API_KEY}" \
  "https://api.vdb.vulnetix.com/v2/vuln/GHSA-9r42-rhw3-2222/fixes/registry"

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References

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