What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-18 · updated 2026-09-22
• Weakness: CWE-617

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.

Affected products

• Red Hat Enterprise Linux 10: all versions
• Red Hat Enterprise Linux 7: all versions
• Red Hat Enterprise Linux 8: all versions
• Red Hat Enterprise Linux 9: all versions
• Red Hat OpenShift Dev Spaces: all versions

References

• https://access.redhat.com/security/cve/CVE-2026-91147
• https://bugzilla.redhat.com/show_bug.cgi?id=2479230
• https://bugzilla.redhat.com/show_bug.cgi?id=2479230

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