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Fencer Intel
high 7.5

CVE-2026-91150 json

Cockpit: cockpit: denial of service via unbounded fragmented websocket messages

published 15h ago modified 15h ago also EUVD-2026-123707

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
—
no EPSS score yet
public exploits
0
none known

Summary

A flaw was found in Cockpit. This vulnerability allows a remote attacker, without prior authentication, to send specially crafted fragmented WebSocket messages. These messages accumulate without a total-size limit, leading to unbounded memory exhaustion and a denial of service in the `cockpit-ws` service.

Patch / fix

Is CVE-2026-91150 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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-2026-91150 updated cvss 7.5

cockpit: cockpit: Denial of Service via unbounded fragmented WebSocket messages

  • 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 Red Hat Enterprise Linux 9 cockpit, cockpit-ws, cockpit-pcp, cockpit-bridge, cockpit-system, cockpit-storaged, +2 more Red Hat Enterprise Linux 10 cockpit Red Hat OpenShift Dev Spaces devspaces/udi-rhel9, devspaces/udi-base-rhel9, devspaces/udi-base-rhel10
    affected: no fix available

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

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

Classification

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

References

Sources

Fencer Intel 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.