Improper Certificate Validation Affecting mattermost-11.1 package, versions <11.1.3-r3
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-CHAINGUARDLATEST-MATTERMOST111-17197593
- published6 Jun 2026
- disclosed22 May 2026
Introduced: 22 May 2026
NewCVE-2026-42508 (opens in a new tab)How to fix?
Upgrade Chainguard mattermost-11.1 to version 11.1.3-r3 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream mattermost-11.1 package and not the mattermost-11.1 package as distributed by Chainguard.
See How to fix? for Chainguard relevant fixed versions and status.
Previously, a revoked 'SignatureKey' belonging to a CA was not correctly checked for revocation. Now, both the 'key' and 'key.SignatureKey' are checked for @revoked.