Issued:
2026-07-15
Updated:
2026-07-15

RHSA-2026:39894 - Release of containers for RHOSO 18.0.21

Synopsis

Release of containers for RHOSO 18.0.21

Type/Severity

Security Advisory Important

Topic

Red Hat OpenStack Services on OpenShift (RHOSO) 18.0.21 containers are now available.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

Red Hat OpenStack Services on OpenShift is a hybrid cloud solution for deploying and managing virtualized and containerized applications in a scalable infrastructure with a Red Hat OpenShift Container Platform (RHOCP) control plane.

Security Fix(es):

  • opencontainers/selinux: container escape and denial of service due to arbitrary write gadgets and procfs write redirects (CVE-2025-52881)
  • Go: Denial of Service vulnerability in certificate chain building (CVE-2026-32280)
  • pyasn1: Denial of Service due to memory exhaustion from malformed RELATIVE-OID (CVE-2026-23490)

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.

Solution

Before applying this update, make sure all previously released errata relevant to your system have been applied.

For details on how to apply this update as a new RHOSO 18.0 deployment, see “Deploying Red Hat OpenStack Services on OpenShift” at https://docs.redhat.com/en/documentation/red_hat_openstack_services_on_openshift/18.0/html/deploying_red_hat_openstack_services_on_openshift/index

For details on how to apply this update to an existing RHOSO 18.0 deployment, see “Updating your environment to the latest maintenance release” at https://docs.redhat.com/en/documentation/red_hat_openstack_services_on_openshift/18.0/html/updating_your_environment_to_the_latest_maintenance_release/index

Affected Products

ProductVersionArch
Red Hat OpenStack Services on OpenShift18.0x86_64

Fixes

(none)

CVEs

References

Additional information