RLSA-2026:96250: Important: cockpit security update

Q: Who is exposed to these issues?

Systems running Cockpit, particularly where its web service is reachable over the network, are exposed. The affected component is cockpit-ws, which supports browser-based administration of GNU/Linux servers.

Q: Does exploitation require an authenticated Cockpit account or user interaction?

The advisory’s CVSS vector indicates network exploitation with no privileges or user interaction required. One issue, CVE-2026-76235, is specifically described as an unauthenticated remote memory leak.

Q: What is the operational impact of the reported flaws?

Two listed issues can cause denial of service: URL-root handling without a trailing slash and unbounded connection-thread spawning. The memory-leak issue may also degrade service availability over time.

Published Nov 10, 2026

Updated

Cockpit enables users to administer GNU/Linux servers using a web browser. It offers network configuration, log inspection, diagnostic reports, SELinux troubleshooting, interactive command-line sessions, and more.

Security Fix(es):

cockpit: Cockpit: Denial of Service in cockpit-ws due to URL-root handling without a trailing slash (CVE-2026-91147)

cockpit: Cockpit: Denial of Service via unbounded connection thread spawning (CVE-2026-91149)

cockpit-ws: cockpit: cockpit-ws: unauthenticated remote memory leak via CockpitLang cookie in sendloginhtml (CVE-2026-76235)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Affected Software

1 affected componentFixes available

rocky-linux/cockpit<0:356.4-1.el10_2.rocky.0.1

0:356.4-1.el10_2.rocky.0.1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade rocky-linux/cockpit to a version that resolves this vulnerability.
Fixed in 0:356.4-1.el10_2.rocky.0.1

Event History

Nov 10, 2026

Advisory Published

via OSV·12:09 PM

Data Sourced

via OSV·12:09 PM

DescriptionSeverityAffected Software

Child vulnerabilities

Contains the following vulnerabilities.

Frequently Asked Questions

Who is exposed to these issues?

Systems running Cockpit, particularly where its web service is reachable over the network, are exposed. The affected component is cockpit-ws, which supports browser-based administration of GNU/Linux servers.

Does exploitation require an authenticated Cockpit account or user interaction?

The advisory’s CVSS vector indicates network exploitation with no privileges or user interaction required. One issue, CVE-2026-76235, is specifically described as an unauthenticated remote memory leak.

What is the operational impact of the reported flaws?

Two listed issues can cause denial of service: URL-root handling without a trailing slash and unbounded connection-thread spawning. The memory-leak issue may also degrade service availability over time.

RLSA-2026:96250: Important: cockpit security update

Affected Software

Remediation

Event History

Child vulnerabilities

Frequently Asked Questions

Who is exposed to these issues?

Does exploitation require an authenticated Cockpit account or user interaction?

What is the operational impact of the reported flaws?

Company

Resources

Contact

Frequently Asked Questions

Who is exposed to these issues?

Does exploitation require an authenticated Cockpit account or user interaction?

What is the operational impact of the reported flaws?