This security update addresses three Denial of Service vulnerabilities in the Go crypto/x509 and crypto/tls libraries used by skopeo, involving inefficient certificate chain validation (CVE-2026-32281, CVSS 7.5 HIGH) and handling of TLS 1.3 key update messages. The underlying Go language vulnerabilities affect versions prior to Go 1.25.9 and Go 1.26.0 through 1.26.1. The fix is included in the updated skopeo package for Red Hat Enterprise Linux 9, which incorporates the patched Go libraries.
Red Hat Product Errata RHSA-2026:28074 - Security Advisory Issued: 2026-06-23 Updated: 2026-06-23 RHSA-2026:28074 - Security Advisory Overview Updated Packages Synopsis Important: skopeo 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 skopeo is now available for Red Hat Enterprise Linux 9. 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 The skopeo command lets you inspect images from container image registries, get images and image layers, and use signatures to create and verify files. Security Fix(es): crypto/x509: golang: Go crypto/x509: Denial of Service via inefficient certificate chain validation (CVE-2026-32281) 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) 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 for x86_64 9 x86_64 Red Hat Enterprise Linux for x86_64 - Extended Update Support 9.8 x86_64 Red Hat Enterprise Linux for IBM z Systems 9 s390x Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 9.8 s390x Red Hat Enterprise Linux for Power, little endian 9 ppc64le Red Hat Enterprise Linux for Power, little endian - Extended Update Support 9.8 ppc64le Red Hat Enterprise Linux for ARM 64 9 aarch64 Red Hat Enterprise Linux for ARM 64 - Extended Update Support 9.8 aarch64 Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 9.8 ppc64le Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.8 x86_64 Red Hat Enterprise Linux for ARM 64 - 4 years of updates 9.8 aarch64 Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 9.8 s390x Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 9.8 x86_64 Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle 9.8 aarch64 Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle 9.8 ppc64le Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle 9.8 s390x Fixes BZ - 2456333 - CVE-2026-32281 crypto/x509: golang: Go crypto/x509: Denial of Service via inefficient certificate chain validation 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-2026-32280 CVE-2026-32281 CVE-2026-32283 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 for x86_64 9 SRPM skopeo-1.22.2-6.el9_8.src.rpm SHA-256: 2a36919d2eb3d1a75138b52d343729ce9625b5d2664677630bd8148b7503bca2 x86_64 skopeo-1.22.2-6.el9_8.x86_64.rpm SHA-256: 954c605d231d1ba23425745b6533f7558fe5b737a50bce95a162eddf5da34008 skopeo-debuginfo-1.22.2-6.el9_8.x86_64.rpm SHA-256: 24ff8b2dd80552ff6046d44ca0cc3975211df56e16a68c6af9383aa4ae87c422 skopeo-debugsource-1.22.2-6.el9_8.x86_64.rpm SHA-256: 54d8084bd026a13b1826726b512340be44d908ec21e6ea5a9de2ab5185b361a3 skopeo-tests-1.22.2-6.el9_8.x86_64.rpm SHA-256: 9dc60b1821252606578544d2476a42205b97410fef73a846efa4a4321752c893 Red Hat Enterprise Linux for x86_64 - Extended Update Support 9.8 SRPM skopeo-1.22.2-6.el9_8.src.rpm SHA-256: 2a36919d2eb3d1a75138b52d343729ce9625b5d2664677630bd8148b7503bca2 x86_64 skopeo-1.22.2-6.el9_8.x86_64.rpm SHA-256: 954c605d231d1ba23425745b6533f7558fe5b737a50bce95a162eddf5da34008 skopeo-debuginfo-1.22.2-6.el9_8.x86_64.rpm SHA-256: 24ff8b2dd80552ff6046d44ca0cc3975211df56e16a68c6af9383aa4ae87c422 skopeo-debugsource-1.22.2-6.el9_8.x86_64.rpm SHA-256: 54d8084bd026a13b1826726b512340be44d908ec21e6ea5a9de2ab5185b361a3 skopeo-tests-1.22.2-6.el9_8.x86_64.rpm SHA-256: 9dc60b1821252606578544d2476a42205b97410fef73a846efa4a4321752c893 Red Hat Enterprise Linux for IBM z Systems 9 SRPM skopeo-1.22.2-6.el9_8.src.rpm SHA-256: 2a36919d2eb3d1a75138b52d343729ce9625b5d2664677630bd8148b7503bca2 s390x skopeo-1.22.2-6.el9_8.s390x.rpm SHA-256: 794d7b16794cade057d795c5a2021b0def110561c025b17b8ba469299a329f55 skopeo-debuginfo-1.22.2-6.el9_8.s390x.rpm SHA-256: 05a0995a49e19b773a5746b205b51a3365871d18bedf751e1b34d71d7dfbcb08 skopeo-debugsource-1.22.2-6.el9_8.s390x.rpm SHA-256: 13554b6808fd90a28c964eb097f100eb0189a16bf8f44c7b4b172b9e8fc59702 skopeo-tests-1.22.2-6.el9_8.s390x.rpm SHA-256: 79ac42db4fb33464c06c1bd021b492222c38497fc4ed2bc58736007456f3e90f Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 9.8 SRPM skopeo-1.22.2-6.el9_8.src.rpm SHA-256: 2a36919d2eb3d1a75138b52d343729ce9625b5d2664677630bd8148b7503bca2 s390x skopeo-1.22.2-6.el9_8.s390x.rpm SHA-256: 794d7b16794cade057d795c5a2021b0def110561c025b17b8ba469299a329f55 skopeo-debuginfo-1.22.2-6.el9_8.s390x.rpm SHA-256: 05a0995a49e19b773a5746b205b51a3365871d18bedf751e1b34d71d7dfbcb08 skopeo-debugsource-1.22.2-6.el9_8.s390x.rpm SHA-256: 13554b6808fd90a28c964eb097f100eb0189a16bf8f44c7b4b172b9e8fc59702 skopeo-tests-1.22.2-6.el9_8.s390x.rpm SHA-256: 79ac42db4fb33464c06c1bd021b492222c38497fc4ed2bc58736007456f3e90f Red Hat Enterprise Linux for Power, little endian 9 SRPM skopeo-1.22.2-6.el9_8.src.rpm SHA-256: 2a36919d2eb3d1a75138b52d343729ce9625b5d2664677630bd8148b7503bca2 ppc64le skopeo-1.22.2-6.el9_8.ppc64le.rpm SHA-256: 43764f343635818bed9569d0fe74e68f79662369d9aef80e00729af803803b45 skopeo-debuginfo-1.22.2-6.el9_8.ppc64le.rpm SHA-256: ca4821ceb106a784277c8dcfa7a31995fe0f1196cd291a58f35d95fbac1c2ed1 skopeo-debugsource-1.22.2-6.el9_8.ppc64le.rpm SHA-256: 78db40519850d043caa86d367681c1652b4f841e3cb7f3e31e748ebddee1d343 skopeo-tests-1.22.2-6.el9_8.ppc64le.rpm SHA-256: 2102ed4bb33270ab6e95edb83653d1708a1ff73f47c0cc4d17985b1e0c20904f Red Hat Enterprise Linux for Power, little endian - Extended Update Support 9.8 SRPM skopeo-1.22.2-6.el9_8.src.rpm SHA-256: 2a36919d2eb3d1a75138b52d343729ce9625b5d2664677630bd8148b7503bca2 ppc64le skopeo-1.22.2-6.el9_8.ppc64le.rpm SHA-256: 43764f343635818bed9569d0fe74e68f79662369d9aef80e00729af803803b45 skopeo-debuginfo-1.22.2-6.el9_8.ppc64le.rpm SHA-256: ca4821ceb106a784277c8dcfa7a31995fe0f1196cd291a58f35d95fbac1c2ed1 skopeo-debugsource-1.22.2-6.el9_8.ppc64le.rpm SHA-256: 78db40519850d043caa86d367681c1652b4f841e3cb7f3e31e748ebddee1d343 skopeo-tests-1.22.2-6.el9_8.ppc64le.rpm SHA-256: 2102ed4bb33270ab6e95edb83653d1708a1ff73f47c0cc4d17985b1e0c20904f Red Hat Enterprise Linux for ARM 64 9 SRPM skopeo-1.22.2-6.el9_8.src.rpm SHA-256: 2a36919d2eb3d1a75138b52d343729ce9625b5d2664677630bd8148b7503bca2 aarch64 skopeo-1.22.2-6.el9_8.aarch64.rpm SHA-256: df9ea6b7c57fbcc9eae8fd7279b9d009be2c56a7dd479d7497655bf387b19c38 skopeo-debuginfo-1.22.2-6.el9_8.aarch64.rpm SHA-256: d4ba8b25b8f599c0f49b18deaa6b36dbd84790b71535bcd5879b92244e162551 skopeo-debugsource-1.22.2-6.el9_8.aarch64.rpm SHA-256: d8660c9f12ef52aec2e062f431cefee9525c7d1a58cf8266920e549763261e35 skopeo-tests-1.22.2-6.el9_8.aarch64.rpm SHA-256: d99eadaf92a21c2165dade79850c74bb87fa344029b5ee78ad879381fe368c5a Red Hat Enterprise Linux for ARM 64 - Extended Update Support 9.8 SRPM skopeo-1.22.2-6.el9_8.src.rpm SHA-256: 2a36919d2eb3d1a75138b52d343729ce9625b5d2664677630bd8148b7503bca2 aarch64 skopeo-1.22.2-6.el9_8.aarch64.rpm SHA-256: df9ea6b7c57fbcc9eae8fd7279b9d009be2c56a7dd479d7497655bf387b19c38 skopeo-debuginfo-1.22.2-6.el9_8.aarch64.rpm SHA-256: d4ba8b25b8f599c0f49b18deaa6b36dbd84790b71535bcd5879b92244e162551 skopeo-debugsource-1.22.2-6.el9_8.aarch64.rpm SHA-256: d8660c9f12ef52aec2e062f431cefee9525c7d1a58cf8266920e549763261e35 skopeo-tests-1.22.2-6.el9_8.aarch64.rpm SHA-256: d99eadaf92a21c2165dade79850c74bb87fa344029b5ee78ad879381fe368c5a Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 9.8 SRPM skopeo-1.22.2-6.el9_8.src.rpm SHA-256: 2a36919d2eb3d1a75138b52d343729ce9625b5d2664677630bd8148b7503bca2 ppc64le skopeo-1.22.2-6.el9_8.ppc64le.rpm SHA-256: 43764f343635818bed9569d0fe74e68f79662369d9aef80e00729af803803b45 skopeo-debuginfo-1.22.2-6.el9_8.ppc64le.rpm SHA-256: ca4821ceb106a784277c8dcfa7a31995fe0f1196cd291a58f35d95fbac1c2ed1 skopeo-debugsource-1.22.2-6.el9_8.ppc64le.rpm SHA-256: 78db40519850d043caa86d367681c1652b4f841e3cb7f3e31e748ebddee1d343 skopeo-tests-1.22.2-6.el9_8.ppc64le.rpm SHA-256: 2102ed4bb33270ab6e95edb83653d1708a1ff73f47c0cc4d17985b1e0c20904f Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.8 SRPM skopeo-1.22.2-6.el9_8.src.rpm SHA-256: 2a36919d2eb3d1a75138b52d343729ce9625b5d2664677630bd8148b7503bca2 x86_64 skopeo-1.22.2-6.el9_8.x86_64.rpm SHA-256: 954c605d231d1ba23425745b6533f7558fe5b737a50bce95a162eddf5da34008 skopeo-debuginfo-1.22.2-6.el9_8.x86_64.rpm SHA-256: 24ff8b2dd80552ff6046d44ca0cc3975211df56e16a68c6af9383aa4ae87c422 skopeo-debugsource-1.22.2-6.el9_8.x86_64.rpm SHA-256: 54d8084bd026a13b1826726b512340be44d908ec21e6ea5a9de2ab5185b361a3 skopeo-tests-1.22.2-6.el9_8.x86_64.rpm SHA-256: 9dc60b1821252606578544d2476a42205b97410fef73a846efa4a4321752c893 Red Hat Enterprise Linux for ARM 64 - 4 years of updates 9.8 SRPM skopeo-1.22.2-6.el9_8.src.rpm SHA-256: 2a36919d2eb3d1a75138b52d343729ce9625b5d2664677630bd8148b7503bca2 aarch64 skopeo-1.22.2-6.el9_8.aarch64.rpm SHA-256: df9ea6b7c57fbcc9eae8fd7279b9d009be2c56a7dd479d7497655bf387b19c38 skopeo-debu