This security update addresses multiple vulnerabilities in the `rhc-worker-script` component for Red Hat Enterprise Linux 7 ELS, including a critical (CVSS 9.1) authorization bypass in gRPC-Go due to improper HTTP/2 path validation (CVE-2026-33186) and several high-severity Go language flaws enabling denial-of-service, privilege escalation, or symlink escapes. The underlying Go vulnerabilities affect versions prior to 1.25.8/1.25.9 and 1.26.0 prior to 1.26.2, while the gRPC flaw affects versions prior to 1.79.3. The fix is applied by updating the `rhc-worker-script` package per the referenced Red Hat advisory.
Red Hat Product Errata RHSA-2026:54191 - Security Advisory Issued: 2026-08-12 Updated: 2026-08-12 RHSA-2026:54191 - Security Advisory Overview Updated Packages Synopsis Important: rhc-worker-script 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 rhc-worker-script is now available for Red Hat Enterprise Linux 7 Extended Lifecycle Support. 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 Remote Host Configuration (rhc) worker for executing scripts on hosts managed by Red Hat Lightspeed. Security Fix(es): net/url: Incorrect parsing of IPv6 host literals in net/url (CVE-2026-25679) google.golang.org/grpc/grpc-go: google.golang.org/grpc/authz: gRPC-Go: Authorization bypass due to improper HTTP/2 path validation (CVE-2026-33186) golang: internal/syscall/unix: Root.Chmod can follow symlinks out of the root (CVE-2026-32282) crypto/tls: golang: Go crypto/tls: Denial of Service via multiple TLS 1.3 key update messages (CVE-2026-32283) crypto/x509: crypto/tls: golang: Go: Denial of Service vulnerability in certificate chain building (CVE-2026-32280) net: golang: Go net package: Denial of Service via long CNAME response in LookupCNAME (CVE-2026-33811) golang.org/x/net/idna: golang: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing (CVE-2026-39821) 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. 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 Enterprise Linux Server - Extended Life Cycle Support 7 x86_64 Fixes 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 - 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 BZ - 2467822 - CVE-2026-33811 net: golang: Go net package: Denial of Service via long CNAME response in LookupCNAME BZ - 2480756 - CVE-2026-39821 golang.org/x/net/idna: golang: net/http: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing CVEs CVE-2026-25679 CVE-2026-32280 CVE-2026-32282 CVE-2026-32283 CVE-2026-33186 CVE-2026-33811 CVE-2026-39821 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 Enterprise Linux Server - Extended Life Cycle Support 7 SRPM rhc-worker-script-0.11-1.el7_9.src.rpm SHA-256: c53278648348b56a4e2c15d9e5baa22f0d709d32fc5a53ca7b4932e9c73336a2 x86_64 rhc-worker-script-0.11-1.el7_9.x86_64.rpm SHA-256: 2e9768b8064a5278944046f3ca5d8f6e3bb7f71644bddb55ed910cbab8c692d2 The Red Hat security contact is secalert@redhat.com . More contact details at https://access.redhat.com/security/team/contact/ .