CVE-2026-91150

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

Published Nov 11, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Redhat enterprise Linux Eus
CPEs cpe:/o:redhat:enterprise_linux_eus:10.2
Vendors & Products Redhat enterprise Linux Eus
References
Type Values Removed Values Added
First Time appeared Redhat rhel Eus
CPEs cpe:/a:redhat:rhel_eus:9.8::appstream
cpe:/o:redhat:rhel_eus:9.8::baseos
Vendors & Products Redhat rhel Eus
References
Type Values Removed Values Added
CPEs cpe:/a:redhat:enterprise_linux:9 cpe:/a:redhat:enterprise_linux:9::appstream
cpe:/o:redhat:enterprise_linux:9::baseos
References
Type Values Removed Values Added
CPEs cpe:/a:redhat:enterprise_linux:10
cpe:/a:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:10.3
cpe:/o:redhat:enterprise_linux:8::baseos
References
Type Values Removed Values Added
Description 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.
Title Cockpit: cockpit: denial of service via unbounded fragmented websocket messages
First Time appeared Redhat
Redhat enterprise Linux
Redhat openshift Devspaces
Redhat rhel Els
Weaknesses CWE-770
CPEs cpe:/a:redhat:enterprise_linux:10
cpe:/a:redhat:enterprise_linux:8
cpe:/a:redhat:enterprise_linux:9
cpe:/a:redhat:openshift_devspaces:3
cpe:/o:redhat:rhel_els:7
Vendors & Products Redhat
Redhat enterprise Linux
Redhat openshift Devspaces
Redhat rhel Els
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
redhat
Published
Updated
Nov 12, 2026, 4:44 PM
Reserved
Sep 14, 2026, 8:36 PM
Status
Awaiting Analysis
Published
Nov 11, 2026, 7:17 PM
Modified
Nov 12, 2026, 5:17 PM
Severity
Important
Public date
Nov 10, 2026, 11:59 PM