# Cockpit: cockpit: denial of service in \`cockpit-ws\` due to url-root handling without a trailing slash

CVE record · `CVE-2026-91147`

- **Identifiers:** `CVE-2026-91147`
- **State:** Confirmed
- **Severity:** CVSS 5.9 Medium
- **Critical:** No
- **CNA:** redhat
- **Weakness (CWE):** [CWE-617](https://cwe.mitre.org/data/definitions/617.html)
- **Tags:** [Denial of service](https://agentprime.io/advisories/tag/dos.md)
- **Technologies:** [Red Hat Enterprise Linux 8](https://agentprime.io/advisories/technology/red-hat-enterprise-linux-8.md) · [Red Hat Enterprise Linux 9](https://agentprime.io/advisories/technology/red-hat-enterprise-linux-9.md) · [Red Hat Enterprise Linux 10](https://agentprime.io/advisories/technology/red-hat-enterprise-linux-10.md) · [Red Hat Enterprise Linux 7](https://agentprime.io/advisories/technology/red-hat-enterprise-linux-7.md) · [Red Hat OpenShift Dev Spaces](https://agentprime.io/advisories/technology/red-hat-openshift-dev-spaces.md)
- **Published:** 18 Sept 2026
- **Updated:** 6 Nov 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: redhat) at 18 Sept 2026, 16:43 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

## Affected products, as the CNA wrote them

- Vendor: Red Hat. Product: Red Hat Enterprise Linux 8.
  - unaffected: `0:310.10-1.el8_10 to before *` (rpm)
  - Other versions: affected
  - Package name: `cockpit`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat Enterprise Linux 9.
  - unaffected: `0:356.4-1.el9_8 to before *` (rpm)
  - Other versions: affected
  - Package name: `cockpit`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat Enterprise Linux 9.
  - unaffected: `0:356.4-1.el9_8 to before *` (rpm)
  - Other versions: affected
  - Package name: `cockpit`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat Enterprise Linux 10.
  - No versions given
  - Other versions: affected
  - Package name: `cockpit`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat Enterprise Linux 7.
  - No versions given
  - Other versions: affected
  - Package name: `cockpit`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat OpenShift Dev Spaces.
  - No versions given
  - Other versions: affected
  - Package name: `devspaces/udi-base-rhel10`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat OpenShift Dev Spaces.
  - No versions given
  - Other versions: affected
  - Package name: `devspaces/udi-base-rhel9`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat OpenShift Dev Spaces.
  - No versions given
  - Other versions: affected
  - Package name: `devspaces/udi-rhel9`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`

## Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

## Severity and exploitation

- 5.9 Medium, CVSS 3.1: `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H`, from CNA (redhat)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0064, the 50th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 18 Sept 2026, 16:43 UTC: [Confirmed by the CVE List](https://www.cve.org/CVERecord?id=CVE-2026-91147)
- 18 Sept 2026, 17:17 UTC: [Confirmed by NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-91147)

## Sources

- [CVE List: CVE-2026-91147](https://www.cve.org/CVERecord?id=CVE-2026-91147)
- [NVD: CVE-2026-91147](https://nvd.nist.gov/vuln/detail/CVE-2026-91147)

### References from the CNA

- <https://access.redhat.com/errata/RHSA-2026:94485> (vendor-advisory, redhat)
- <https://access.redhat.com/errata/RHSA-2026:94533> (vendor-advisory, redhat)
- <https://access.redhat.com/security/cve/CVE-2026-91147> (vdb-entry, redhat)
- <https://bugzilla.redhat.com/show_bug.cgi?id=2479230> (issue-tracking, redhat)

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.

## Check whether this affects you

This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. Compare the affected versions above with what you run.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), `get_advisory` returns this record and `search_advisories` finds related ones. Setup: <https://agentprime.io/mcp.md>
- As JSON: <https://api.agentprime.io/v1/advisories/CVE-2026-91147>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-91147/>. Everything for agents: <https://agentprime.io/llms.txt>.