Is CVE-2026-91147 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-91147?

CVE-2026-91147 has a CVSS v3 severity of MEDIUM (5.9).

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CVE-2026-91147

Description

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.