Vulnerability in Red Hat Enterprise Linux 8

[ Why it matters ]Priority signals

• Public proof-of-concept exploit exists (CISA SSVC)

[ Description ]Official 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.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund2 Nov 2026WID-SEC-2026-4301

  Red Hat Enterprise Linux (cockpit): Multiple vulnerabilities allow denial of service Translated from German

  Risk mediumCVE-2026-76235CVE-2026-91147

[ References ]References

• access.redhat.com/errata/RHSA-2026:94485vendor-advisoryx_refsource_REDHAT
• access.redhat.com/errata/RHSA-2026:94533vendor-advisoryx_refsource_REDHAT
• access.redhat.com/security/cve/CVE-2026-91147vdb-entryx_refsource_REDHAT
• bugzilla.redhat.com/show_bug.cgiissue-trackingx_refsource_REDHAT