{"id":"CVE-2026-91147","title":"A flaw was found in `cockpit-ws`","summary":"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 t…","severity":"medium","cvss":5.9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-617"],"vendor":"Red Hat","product":"cockpit","affected":["cockpit (all versions)","cockpit (all versions)","cockpit (all versions)","cockpit (all versions)","devspaces/udi-base-rhel10 (all versions)","devspaces/udi-base-rhel9 (all versions)","devspaces/udi-rhel9 (all versions)"],"published":"2026-09-18","updated":"2026-09-22","sourceUpdated":"2026-09-22T17:17:28.777","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-91147","references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-91147","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2479230","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2479230","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-91147.json"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-91147"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-91147"}],"tags":["nvd","cve.org","exploit-available","csaf","vex","red-hat"],"epss":0.00404,"epssPercentile":0.34475,"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-22T16:23:18.184024Z"},"ingestedAt":"2026-09-18T16:45:41.403Z","slug":"CVE-2026-91147","body":"## Overview\n\nA 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Dev Spaces · no fix planned: Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Dev Spaces, … · updated 2026-09-22 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-91147.json)","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":32.5,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":209214,"id":"CVE-2026-91147","ts":1790096883780,"field":"exploit_available","old":"false","new":"true"}]}