This security update addresses multiple vulnerabilities in etcd for Red Hat OpenStack Platform 17.1, including authorization bypasses (CVE-2026-33413), denial of service vectors in TLS and certificate parsing, and memory exhaustion in URL query parsing (CVE-2025-61726, CVSS 7.5 High). The advisory is rated Important and patches are provided for the etcd component. IT professionals should apply the update via the referenced Red Hat solution article to mitigate these risks.
Red Hat Product Errata RHSA-2026:28047 - Security Advisory Issued: 2026-06-22 Updated: 2026-06-22 RHSA-2026:28047 - Security Advisory Overview Updated Packages Synopsis Important: Red Hat OpenStack Platform 17.1 (etcd) security update Type/Severity Security Advisory: Important Red Hat Lightspeed patch analysis Identify and remediate systems affected by this advisory. View affected systems Topic An update for etcd is now available for Red Hat OpenStack Platform 17.1 (Wallaby). 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 etcd is a highly-available key value store for shared configuration. Security Fix(es): net/url: Memory exhaustion in query parameter parsing in net/url (CVE-2025-61726) golang: Denial of Service due to excessive resource consumption via crafted certificate (CVE-2025-61729) Incorrect parsing of IPv6 host literals in net/url (CVE-2026-25679) Incorrect enforcement of email constraints in crypto/x509 (CVE-2026-27137) crypto/tls: golang: Go: Denial of Service vulnerability in certificate chain building (CVE-2026-32280) golang: Go crypto/tls: Denial of Service via multiple TLS 1.3 key update messages (CVE-2026-32283) google.golang.org/grpc/authz: gRPC-Go: Authorization bypass due to improper HTTP/2 path validation (CVE-2026-33186) golang: Go crypto/x509: Certificate validation bypass due to incorrect DNS constraint application (CVE-2026-33810) crypto/tls: Incorrect certificate validation during TLS session resumption (CVE-2025-68121) internal/syscall/unix: Root.Chmod can follow symlinks out of the root (CVE-2026-32282) etcd: Authorization bypass allows information disclosure and denial of service (CVE-2026-33413) 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 For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Affected Products Red Hat OpenStack 17.1 for RHEL 9 x86_64 Fixes BZ - 2418462 - CVE-2025-61729 crypto/x509: golang: Denial of Service due to excessive resource consumption via crafted certificate BZ - 2434432 - CVE-2025-61726 golang: net/url: Memory exhaustion in query parameter parsing in net/url BZ - 2437111 - CVE-2025-68121 crypto/tls: crypto/tls: Incorrect certificate validation during TLS session resumption BZ - 2445356 - CVE-2026-25679 net/url: Incorrect parsing of IPv6 host literals in net/url BZ - 2449833 - CVE-2026-33186 google.golang.org/grpc/grpc-go: google.golang.org/grpc/authz: gRPC-Go: Authorization bypass due to improper HTTP/2 path validation BZ - 2451728 - CVE-2026-33413 etcd: etcd: Authorization bypass allows information disclosure and denial of service BZ - 2456336 - CVE-2026-32282 golang: internal/syscall/unix: Root.Chmod can follow symlinks out of the root BZ - 2456338 - CVE-2026-32283 crypto/tls: golang: Go crypto/tls: Denial of Service via multiple TLS 1.3 key update messages BZ - 2456339 - CVE-2026-32280 crypto/x509: crypto/tls: golang: Go: Denial of Service vulnerability in certificate chain building CVEs CVE-2025-61726 CVE-2025-61729 CVE-2025-68121 CVE-2026-25679 CVE-2026-27137 CVE-2026-32280 CVE-2026-32282 CVE-2026-32283 CVE-2026-33186 CVE-2026-33413 CVE-2026-33810 References https://access.redhat.com/security/updates/classification/#important Note: More recent versions of these packages may be available. Click a package name for more details. Red Hat OpenStack 17.1 for RHEL 9 SRPM etcd-3.4.26-9.5.el9ost.src.rpm SHA-256: 1b88e401549e54d549cb5654a4fd968bb321df4303120dd0adb9f913559f80be x86_64 etcd-3.4.26-9.5.el9ost.x86_64.rpm SHA-256: fb760179ea6eb0cbb34c34ce27605da703d8474675d3cd022c04e777bb177944 etcd-debuginfo-3.4.26-9.5.el9ost.x86_64.rpm SHA-256: 2c70647256cabc34da5e5cdf6590727d922f167c23759ea93174c9f4129c0d89 etcd-debugsource-3.4.26-9.5.el9ost.x86_64.rpm SHA-256: bbfcda6011ae6de7b740d8afe691735dc5e3b694ee6d76e15f1672ef78edee0a The Red Hat security contact is secalert@redhat.com . More contact details at https://access.redhat.com/security/team/contact/ .