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.
Published: 2026-09-18
Score: 5.9 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

Vendor Workaround

A code fix is being pursued for the affected streams. Until updated packages are available, avoid configuring a non-empty [WebService] UrlRoot in cockpit-ws where feasible. If a non-empty UrlRoot is required, configure the front-end proxy or TLS terminator in front of cockpit-ws to rewrite or redirect requests for the exact configured prefix (for example, /cockpit) to the trailing-slash form (for example, /cockpit/) before forwarding them, so the exact-prefix request never reaches cockpit-ws unnormalized. Deployments whose front end already normalizes or redirects such requests are not exposed through that route.

Tracking

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Advisories

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History

Tue, 22 Sep 2026 17:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 21 Sep 2026 19:45:00 +0000

Type Values Removed Values Added
First Time appeared Redhat openshift Dev Spaces
Vendors & Products Redhat openshift Dev Spaces

Sat, 19 Sep 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Fri, 18 Sep 2026 16:45:00 +0000

Type Values Removed Values Added
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.
Title Cockpit: cockpit: denial of service in `cockpit-ws` due to url-root handling without a trailing slash
First Time appeared Redhat
Redhat enterprise Linux
Redhat openshift Devspaces
Weaknesses CWE-617
CPEs cpe:/a:redhat:openshift_devspaces:3
cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
Redhat openshift Devspaces
References
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'}


Subscriptions

Redhat Enterprise Linux Openshift Dev Spaces Openshift Devspaces
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-10-16T12:19:08.640Z

Reserved: 2026-09-14T20:35:52.198Z

Link: CVE-2026-91147

cve-icon Vulnrichment

Updated: 2026-09-22T16:22:28.368Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-18T17:17:05.427

Modified: 2026-09-22T17:17:28.777

Link: CVE-2026-91147

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-09-18T16:29:00Z

Links: CVE-2026-91147 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-09-21T19:25:16Z

Weaknesses