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Fencer Vulns
medium 5.9

CVE-2026-91147 json

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

published 2026-09-18 51 d ago modified 2026-11-06 3 d ago also EUVD-2026-83175

cvss
5.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 50%
public exploits
0
none known

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 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.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 8 0:310.10-1.el8_10
  • Red Hat Red Hat Enterprise Linux 9 0:356.4-1.el9_8
  • cockpit Debian 14 368-1

debian advisories DEBIAN-CVE-2026-91147

  • cockpit openSUSE Tumbleweed 370-1.1

opensuse advisories openSUSE-SU-2026:12427-1

  • cockpit AlmaLinux 8 310.10-1.el8_10
  • cockpit-ws AlmaLinux 8 310.10-1.el8_10
  • cockpit-bridge AlmaLinux 8 310.10-1.el8_10
  • cockpit-system AlmaLinux 8 310.10-1.el8_10
  • cockpit AlmaLinux 9 356.4-1.el9_8
  • cockpit-ws AlmaLinux 9 356.4-1.el9_8
  • cockpit-bridge AlmaLinux 9 356.4-1.el9_8
  • cockpit-system AlmaLinux 9 356.4-1.el9_8

almalinux advisories ALSA-2026:94485ALSA-2026:94533

  • cockpit Rocky Linux 9 356.4-1.el9_8.rocky.0.1
  • cockpit Rocky Linux 8 310.10-1.el8_10

rocky linux advisories RLSA-2026:94533RLSA-2026:94485

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-91147 updated cvss 5.9

cockpit: Cockpit: Denial of Service in `cockpit-ws` due to URL-root handling without a trailing slash

  • Red Hat Enterprise Linux 7 cockpit, cockpit-ws, cockpit-bridge, cockpit-system, cockpit-machines-ovirt
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Enterprise Linux 10 cockpit
    affected: workaround, no fix available
  • Red Hat OpenShift Dev Spaces devspaces/udi-rhel9, devspaces/udi-base-rhel9, devspaces/udi-base-rhel10
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Enterprise Linux AppStream (v. 9) cockpit-storaged 356.4-1.el9_8, cockpit-packagekit 356.4-1.el9_8
    fixed: vendor fix RHSA-2026:94533
  • Red Hat Enterprise Linux BaseOS (v. 8) cockpit 310.10-1.el8_10, cockpit-ws 310.10-1.el8_10, cockpit-bridge 310.10-1.el8_10, cockpit-system 310.10-1.el8_10
    fixed: vendor fix RHSA-2026:94485
  • Red Hat Enterprise Linux BaseOS (v. 9) cockpit 356.4-1.el9_8, cockpit-ws 356.4-1.el9_8, cockpit-bridge 356.4-1.el9_8, cockpit-system 356.4-1.el9_8, cockpit-ws-selinux 356.4-1.el9_8
    fixed: vendor fix RHSA-2026:94533

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
47 d ago

Exploit prediction

0.64% chance of exploitation in the next 30 days, higher than 50% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=2479230 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

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

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.