Denial of Service Vulnerability in Cockpit by Red Hat
CVE-2026-91149

7.5HIGH

Key Information:

Vendor

Red Hat
Status
Red Hat Enterprise Linux 9
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Vendor
CVE Published:
18 September 2026

What is CVE-2026-91149?

A vulnerability in the Cockpit service allows unauthenticated remote attackers to exploit it by establishing multiple simultaneous connections to the cockpit-tls service. This behavior leads to the creation of an excessive number of detached threads, which consumes system resources, including memory and file descriptors. As a result, the service can experience degradation or become completely unavailable for legitimate users, potentially disrupting operations and access.

Affected Version(s)

Red Hat Enterprise Linux 9 0:356.4-1.el9_8

Red Hat Enterprise Linux 9 0:356.4-1.el9_8

References

https://access.redhat.com/errata/RHSA-2026:94533
vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-91149
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2479422
issue-trackingx_refsource_REDHAT

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.
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