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Medium severity · published Sep 18, 2026
CVE-2026-91147
Cockpit: cockpit: denial of service in `cockpit-ws` due to url-root handling without a trailing slash
5.9
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 34% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RH
Red Hat Enterprise Linux 10 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 7 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 8 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 9 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat OpenShift Dev Spaces · Red Hat
All versions, or not specified · source: vendor
Affected product
RH
Red Hat Enterprise Linux 10
Red Hat
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-91147
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-91147
access.redhat.com
https://access.redhat.com/security/cve/CVE-2026-91147
bugzilla.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2479230
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