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: Denial of Service
Action: Patch
AI Analysis

Impact

The flaw in the cockpit‑ws component allows a remote, unauthenticated attacker to trigger a DoS by sending a specially crafted request. When the WebService.UrlRoot is configured and the attacker requests the exact URL‑root prefix without a trailing slash, cockpit‑ws terminates unexpectedly, rendering the Cockpit web service unavailable. No privilege escalation or data compromise is involved, but the service being unreachable may disrupt system management and operations.

Affected Systems

Red Hat Enterprise Linux versions 7 through 10 and Red Hat OpenShift Dev Spaces version 3 are affected. The vulnerability is tied to the cockpit‑ws component, which is part of the Cockpit web interface used for system administration.

Risk and Exploitability

The CVSS score of 5.9 indicates a moderate level of severity. EPSS is not available, and the vulnerability is not listed in CISA’s KEV catalog. Attackers can exploit the flaw from any remote host that can reach the Cockpit service without authentication. Because the attack only requires crafting a specific URL request, the likelihood of exploitation is relatively high in exposed environments, warranting prompt remediation.

Generated by OpenCVE AI on September 19, 2026 at 12:14 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Apply Red Hat’s latest security patch that corrects the URL‑root handling bug in cockpit‑ws.
  • Verify that the WebService.UrlRoot configuration includes a trailing slash or consider removing the custom url‑root setting to avoid the DoS issue.
  • If a patch is not yet available, disable cockpit‑ws or block external access to the Cockpit web service until the fix is deployed.

Generated by OpenCVE AI on September 19, 2026 at 12:14 UTC.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

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: 2026-09-22T16:23:24.554Z

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