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.
CVE-2026-91147
MEDIUMPre-NVD 5.95.9—Trending — 3 sources updated this week
EchelonGraph scoreHIGH confidence
Score 5.9 from GitHub Security Advisory published 2026-09-18. a secondary CVSS source baseline 5.9; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
5.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.9Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 5.9
- EG Score
- 5.9(high)
- EG Risk
- 31(Track)EG Risk 31/100SSVC: Track
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity59% × 45%Exploitation0% × 40%Automatability30% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 0%
- EPSS %ILE
- 26%
- KEV
- Not listed
Published
September 18, 2026
Last Modified
September 18, 2026
Advisory Details (2)
Auto-updated Sep 18, 2026Patch available. Sources: redhat.
redhat
2479230 – (CVE-2026-91147) CVE-2026-91147 cockpit: Cockpit: Denial of Service in `cockpit-ws` due to URL-root handling without a trailing slash
https://bugzilla.redhat.com/show_bug.cgi?id=2479230redhat Patch Available
CVE-2026-91147 - Red Hat Customer Portal
Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a
https://access.redhat.com/security/cve/CVE-2026-91147Vendor Advisories for CVE-2026-91147(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 7× in last 7d / 7× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-09-19 19:48 UTCEG score recompute
- 2026-09-19 19:48 UTCGHSA enrichment
- 2026-09-18 19:07 UTCEG score recompute
- 2026-09-18 19:07 UTCGHSA enrichment
- 2026-09-18 17:26 UTCEG score recompute
- 2026-09-18 16:49 UTCEG score recompute
- 2026-09-18 16:49 UTCMITRE cvelistV5first tracked
Frequently asked(5)
What is CVE-2026-91147?
CVE-2026-91147 is a medium vulnerability published on September 18, 2026. 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…
When was CVE-2026-91147 disclosed?
CVE-2026-91147 was first published in the National Vulnerability Database on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-91147 actively exploited?
CVE-2026-91147 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 73.9% of all scored CVEs.
What is the CVSS score of CVE-2026-91147?
CVE-2026-91147 has a CVSS v3 base score of 5.9 (NVD).
How do I remediate CVE-2026-91147?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-91147, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-91147
Is Your Infrastructure Affected by CVE-2026-91147?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.