CVE-2026-91150
Cockpit: cockpit: denial of service via unbounded fragmented websocket messages
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-770 |
| Vendor | red hat |
| Product | red hat enterprise linux 10 |
| Published | Nov 11, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
Red Hat / Red Hat Enterprise Linux 10
All versions affected Red Hat / Red Hat Enterprise Linux 7
All versions affected Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat OpenShift Dev Spaces
All versions affected Red Hat / Red Hat OpenShift Dev Spaces
All versions affected Red Hat / Red Hat OpenShift Dev Spaces
All versions affected References
access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-91150 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2478436 github.com: https://github.com/cockpit-project/cockpit/commit/4bc66ac3e5b4923528f1ac89517a009b7bc90f93 github.com: https://github.com/cockpit-project/cockpit/releases/tag/372
Credits
This issue was discovered by AISLE Research and Found by AISLE in partnership with Red Hat.