CVE-2026-91147

A flaw was found in `cockpit-ws`. This vulnerability allows a remote, unauthenticated attacker to cause a Denial of Service (DoS) by sending a specially crafted request. When the `WebService.UrlRoot` is configured and a request is made to the exact URL-root prefix without a trailing slash, `cockpit-ws` can terminate unexpectedly. This issue leads to the unavailability of the Cockpit web service.

  • Published Sep 18, 2026
  • CVSS 5.9 medium
  • 0.4% chance of exploitation in the next 30 days (EPSS)

Affected software

CVE-2026-91147 at the National Vulnerability Database