RHSA-2026:60302: Release of containers for RHOSO 18.0.22 security update
Red Hat OpenStack Services on OpenShift is a hybrid cloud solutionfor deploying and managing virtualized and containerized applications in ascalable infrastructure with a Red Hat OpenShift Container Platform (RHOCP)control plane.Security Fixes: golang: net package: Denial of Service via long CNAME response in LookupCNAME (CVE-2026-33811) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page listed in the References section.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Red Hat OpenStack Services on OpenShift (RHOSO) 18.0to a version that resolves this vulnerability.Fixed in 18.0.22 - Compensating control
Before applying the RHOSO 18.0.22 security update, ensure all previously released errata relevant to your system have been applied.
Event History
Frequently Asked Questions
What condition is required to trigger the denial of service?
The issue is triggered by a long CNAME response processed through Go's net package LookupCNAME functionality. The provided advisory does not specify whether an attacker must control a DNS server or otherwise influence DNS responses.
Which deployments should prioritize this update?
Deployments using the affected RHOSO 18.0.22 container release and software incorporating golang/net should prioritize the security update. The advisory identifies Red Hat OpenStack Services on OpenShift with a Red Hat OpenShift Container Platform control plane as the relevant environment.