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Fencer Vulns
high 7.5

CVE-2026-91149 json

Cockpit: cockpit: denial of service via unbounded connection thread spawning

published 2026-09-18 51 d ago modified 2026-11-09 16 min ago also EUVD-2026-83174

cvss
7.5
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 47%
public exploits
0
none known

Summary

A flaw was found in Cockpit. An unauthenticated remote attacker can exploit this vulnerability by initiating and sustaining numerous simultaneous connections to the `cockpit-tls` service. This forces the service to create an unbounded number of detached threads, consuming system resources such as memory and file descriptors. The primary consequence is a denial of service (DoS), leading to degradation or complete unavailability of the Cockpit service for legitimate users.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 10 0:356.4-1.el10_2
  • Red Hat Red Hat Enterprise Linux 9 0:356.4-1.el9_8
  • cockpit Debian 14 368-1

debian advisories DEBIAN-CVE-2026-91149

  • cockpit openSUSE Tumbleweed 370-1.1

opensuse advisories openSUSE-SU-2026:12427-1

  • 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
  • cockpit-storaged AlmaLinux 9 356.4-1.el9_8
  • cockpit-packagekit AlmaLinux 9 356.4-1.el9_8
  • cockpit-ws-selinux AlmaLinux 9 356.4-1.el9_8

almalinux advisories ALSA-2026:94533

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

rocky linux advisories RLSA-2026:94533

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-2026-91149 updated cvss 7.5

cockpit: Cockpit: Denial of Service via unbounded connection thread spawning

  • Red Hat Enterprise Linux 7 cockpit, cockpit-ws, cockpit-bridge, cockpit-system, cockpit-machines-ovirt Red Hat Enterprise Linux 8 cockpit, cockpit-ws, cockpit-bridge, cockpit-system
    affected: workaround, no fix available
  • 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 AppStream (v. 10) cockpit-storaged 356.4-1.el10_2, cockpit-packagekit 356.4-1.el10_2
    fixed: vendor fix RHSA-2026:96250
  • 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 Enterprise Linux BaseOS (v. 10) cockpit 356.4-1.el10_2, cockpit-ws 356.4-1.el10_2, cockpit-bridge 356.4-1.el10_2, cockpit-system 356.4-1.el10_2, cockpit-ws-selinux 356.4-1.el10_2
    fixed: vendor fix RHSA-2026:96250
  • Red Hat OpenShift Dev Spaces devspaces/udi-rhel9, devspaces/udi-base-rhel9, devspaces/udi-base-rhel10
    not affected: vulnerable code not present

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
none
Automatable
yes
Technical impact
partial
Assessed
51 d ago

Exploit prediction

0.57% chance of exploitation in the next 30 days, higher than 47% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

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

Classification

Weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling

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.