5.9 Medium

CVE-2026-91147 Cockpit: cockpit: denial of service in `cockpit-ws` due to url-root handling without a trailing slash

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.

CVSS 3.1 detail

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

Exploitable remotely over the network, without an account and without any user action; an attacker can seriously compromise confidentiality, integrity or availability.

Attack vector: Network
Attack complexity: High
Privileges required: None
Interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

Affected products and versions

Product	Affected versions	Fixed in
Red Hat Enterprise Linux 10	Versions not published
Red Hat Enterprise Linux 7	Versions not published
Red Hat Enterprise Linux 8	Versions not published
Red Hat Enterprise Linux 9	Versions not published
Red Hat OpenShift Dev Spaces	Versions not published

References

RHSA-2026:94485 access.redhat.com
RHSA-2026:94533 access.redhat.com
access.redhat.com access.redhat.com
RHBZ#2479230 bugzilla.redhat.com

Timeline

Published September 18, 2026
Last modified November 6, 2026

The 1454 CVEs of Red Hat Enterprise Linux 10 →

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