Denial of Service Vulnerability in Cockpit Web Services by Red Hat
CVE-2026-91147

5.9MEDIUM

Key Information:

Vendor

Red Hat
Status
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 9
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 7
Vendor
CVE Published:
18 September 2026

What is CVE-2026-91147?

A vulnerability has been identified in 'cockpit-ws', which enables remote, unauthenticated attackers to launch a Denial of Service (DoS) attack. This issue arises when the 'WebService.UrlRoot' is set up without a trailing slash and a request is made to the exact URL-root prefix. The improper handling of this request can cause 'cockpit-ws' to crash unexpectedly, rendering the Cockpit web service unavailable for legitimate users.

Affected Version(s)

Red Hat Enterprise Linux 8 0:310.10-1.el8_10

Red Hat Enterprise Linux 9 0:356.4-1.el9_8

Red Hat Enterprise Linux 9 0:356.4-1.el9_8

References

https://access.redhat.com/errata/RHSA-2026:94485
vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:94533
vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-91147
vdb-entryx_refsource_REDHAT

CVSS V3.1

Score:
5.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

This issue was discovered by Found by AISLE in partnership with Red Hat.
.