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  4. CVE 2026 91147 cockpit cockpit denial of service in cockpit ws
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Back to active CVEs
Medium · CVSS 5.9CVE-2026-91147

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

Answer in brief

CVE-2026-91147 records a Medium severity (CVSS 5.9) vulnerability in Cockpit: cockpit: denial of service in `cockpit-ws` due to url-root handling without a trailing slash. The current sources do not mark it as known exploited. The current feed maps Red Hat/cockpit (generic), Red Hat/devspaces/udi-base-rhel10 (generic), Red Hat/devspaces/udi-base-rhel9 (generic), Red Hat/devspaces/udi-rhel9 (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 18, 2026Updated Oct 16, 2026Source checked Nov 2, 2026First seen by HOL Sep 18, 2026Material review Oct 16, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 5.9
Exploitation
Not marked as known exploited
Affected software
4 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 5.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Red Hat/cockpit (generic), Red Hat/devspaces/udi-base-rhel10 (generic), Red Hat/devspaces/udi-base-rhel9 (generic), Red Hat/devspaces/udi-rhel9 (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Red Hat/cockpitgeneric*Not reported
Red Hat/devspaces/udi-base-rhel10generic*Not reported
Red Hat/devspaces/udi-base-rhel9generic*Not reported
Red Hat/devspaces/udi-rhel9generic*Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Red Hat/cockpit, Red Hat/devspaces/udi-base-rhel10, Red Hat/devspaces/udi-base-rhel9.
  2. 2Review the reported fix. Source-reported 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.

Evidence timeline and material changes

  1. Published upstream

    Sep 18, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 16, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Sep 18, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-617
Source
CVE List V5
Source checked
Nov 2, 2026
References
2 linked sources
Open source record