Memory Exhaustion Vulnerability in Cockpit by Red Hat
CVE-2026-91150

7.5HIGH

Key Information:

Vendor

Red Hat
Status
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 9
Vendor
CVE Published:
11 November 2026

What is CVE-2026-91150?

A flaw has been identified in Cockpit that permits remote attackers to send specially crafted fragmented WebSocket messages without prior authentication. These malicious messages can be sent continuously, causing unbounded memory accumulation, which may lead to significant memory exhaustion and ultimately result in a denial of service for the cockpit-ws service, affecting system availability.

References

https://access.redhat.com/security/cve/CVE-2026-91150
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2478436
issue-trackingx_refsource_REDHAT
https://github.com/cockpit-project/cockpit/commit/4bc66ac...

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

This issue was discovered by AISLE Research and Found by AISLE in partnership with Red Hat.
.