This Red Hat security update for Buildah addresses three high-severity Denial of Service vulnerabilities (CVSS 7.5) in its underlying Go components: a crafted JWE object in go-jose (CVE-2026-34986), multiple TLS 1.3 key update messages (CVE-2026-32283), and a flaw in certificate chain building (CVE-2026-32280). The go-jose library is affected in versions 3.0.0 through 3.0.4 and 4.0.0 through 4.1.3, requiring an upgrade to 3.0.5 or 4.1.4, while the Go runtime vulnerabilities affect versions prior to 1.25.9 and 1.26.0 through 1.26.1, fixed in Go 1.25.9 and 1.26.2. The advisory provides patched Buildah packages for Red Hat Enterprise Linux 9.6 Extended Update Support.
Red Hat Product Errata RHSA-2026:20607 - Security Advisory Issued: 2026-05-26 Updated: 2026-05-26 RHSA-2026:20607 - Security Advisory Overview Updated Packages Synopsis Important: buildah 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 buildah is now available for Red Hat Enterprise Linux 9.6 Extended Update 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 The buildah package provides a tool for facilitating building OCI container images. Among other things, buildah enables you to: Create a working container, either from scratch or using an image as a starting point; Create an image, either from a working container or using the instructions in a Dockerfile; Build both Docker and OCI images. Security Fix(es): github.com/go-jose/go-jose/v3: github.com/go-jose/go-jose/v4: Go JOSE: Denial of Service via crafted JSON Web Encryption (JWE) object (CVE-2026-34986) 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 - Extended Update Support 9.6 x86_64 Red Hat Enterprise Linux Server - AUS 9.6 x86_64 Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 9.6 s390x Red Hat Enterprise Linux for Power, little endian - Extended Update Support 9.6 ppc64le Red Hat Enterprise Linux for ARM 64 - Extended Update Support 9.6 aarch64 Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 9.6 ppc64le Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.6 x86_64 Red Hat Enterprise Linux for ARM 64 - 4 years of updates 9.6 aarch64 Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 9.6 s390x Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 9.6 x86_64 Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle 9.6 aarch64 Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle 9.6 ppc64le Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle 9.6 s390x Fixes BZ - 2455470 - CVE-2026-34986 github.com/go-jose/go-jose/v3: github.com/go-jose/go-jose/v4: Go JOSE: Denial of Service via crafted JSON Web Encryption (JWE) object 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-2026-32283 CVE-2026-34986 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 - Extended Update Support 9.6 SRPM buildah-1.39.9-1.el9_6.src.rpm SHA-256: c00f7092d990f3ed4c292f0adfabd1bec93c4bb2f814d0064bbd6677d11ddbb2 x86_64 buildah-1.39.9-1.el9_6.x86_64.rpm SHA-256: 7cdc1cc704dd2a5e3412f5eaeb2267c37a1b5826468300a1fc0ec65ae07af069 buildah-debuginfo-1.39.9-1.el9_6.x86_64.rpm SHA-256: 99a4dc90176425b40589b64e391e3d92914661b2b5d84b9f217bfc764e2e18ed buildah-debugsource-1.39.9-1.el9_6.x86_64.rpm SHA-256: 099127c818731d1dabdb632e6ddc84cfbcf7e5efd7b27dd9caa3a2e1ecd3b037 buildah-tests-1.39.9-1.el9_6.x86_64.rpm SHA-256: 5ff9ba674861bcbe42e535f5504919a5ca78a7ed077637219ccbe9d6571528db buildah-tests-debuginfo-1.39.9-1.el9_6.x86_64.rpm SHA-256: a40af236932ee3e77c68a85d44e18f1d85fbb97601cb5247f4902f7837008877 Red Hat Enterprise Linux Server - AUS 9.6 SRPM buildah-1.39.9-1.el9_6.src.rpm SHA-256: c00f7092d990f3ed4c292f0adfabd1bec93c4bb2f814d0064bbd6677d11ddbb2 x86_64 buildah-1.39.9-1.el9_6.x86_64.rpm SHA-256: 7cdc1cc704dd2a5e3412f5eaeb2267c37a1b5826468300a1fc0ec65ae07af069 buildah-debuginfo-1.39.9-1.el9_6.x86_64.rpm SHA-256: 99a4dc90176425b40589b64e391e3d92914661b2b5d84b9f217bfc764e2e18ed buildah-debugsource-1.39.9-1.el9_6.x86_64.rpm SHA-256: 099127c818731d1dabdb632e6ddc84cfbcf7e5efd7b27dd9caa3a2e1ecd3b037 buildah-tests-1.39.9-1.el9_6.x86_64.rpm SHA-256: 5ff9ba674861bcbe42e535f5504919a5ca78a7ed077637219ccbe9d6571528db buildah-tests-debuginfo-1.39.9-1.el9_6.x86_64.rpm SHA-256: a40af236932ee3e77c68a85d44e18f1d85fbb97601cb5247f4902f7837008877 Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 9.6 SRPM buildah-1.39.9-1.el9_6.src.rpm SHA-256: c00f7092d990f3ed4c292f0adfabd1bec93c4bb2f814d0064bbd6677d11ddbb2 s390x buildah-1.39.9-1.el9_6.s390x.rpm SHA-256: d03900291b25baff0cf6efe945b8586cc93f4fa956c82b97e4d50fdf6009db49 buildah-debuginfo-1.39.9-1.el9_6.s390x.rpm SHA-256: d92c76fe5e3392a91b250a9a5e966626fa5e744ab2ad49093db61437922069cd buildah-debugsource-1.39.9-1.el9_6.s390x.rpm SHA-256: f2a1a64ac6b7c0a80f8b6331d277e8192ce5857ecc73e0f316a616a583cb7bc7 buildah-tests-1.39.9-1.el9_6.s390x.rpm SHA-256: 7dc74b17f60bae32300f1eac738cb081feebfde212fa709f3b4519b3139eb84f buildah-tests-debuginfo-1.39.9-1.el9_6.s390x.rpm SHA-256: 1c18d212f93f2d0bbf0a1d3bdfbf4d88094f7f6ef03973468152ac776dcacc4f Red Hat Enterprise Linux for Power, little endian - Extended Update Support 9.6 SRPM buildah-1.39.9-1.el9_6.src.rpm SHA-256: c00f7092d990f3ed4c292f0adfabd1bec93c4bb2f814d0064bbd6677d11ddbb2 ppc64le buildah-1.39.9-1.el9_6.ppc64le.rpm SHA-256: 2bd23ecfafc88b7567459eab8f1cbe0e39fb911fbfde5a6c79e1cbd53adf49c2 buildah-debuginfo-1.39.9-1.el9_6.ppc64le.rpm SHA-256: 17b43bbc29a9c5b5aac37eadc0f933c7dae5d01b39d28ad5afcbf15b3942f8ae buildah-debugsource-1.39.9-1.el9_6.ppc64le.rpm SHA-256: f9aa726c05d759ac6b4c7febff3913322552a9e938c3175779ae6ef0431d34a1 buildah-tests-1.39.9-1.el9_6.ppc64le.rpm SHA-256: 403073de62e03f78d6c13ab319889f89d25d76cca9a9497b611a096b8bdd1528 buildah-tests-debuginfo-1.39.9-1.el9_6.ppc64le.rpm SHA-256: 48e3d5a6500e55bc34fd0650de83a0ddfaf65a9b0b12cef6a4a1ff716583def2 Red Hat Enterprise Linux for ARM 64 - Extended Update Support 9.6 SRPM buildah-1.39.9-1.el9_6.src.rpm SHA-256: c00f7092d990f3ed4c292f0adfabd1bec93c4bb2f814d0064bbd6677d11ddbb2 aarch64 buildah-1.39.9-1.el9_6.aarch64.rpm SHA-256: 43c7685442bd5022449a0638424b7974468bb0084072e8a730cd2a593bc85ec5 buildah-debuginfo-1.39.9-1.el9_6.aarch64.rpm SHA-256: f47e7904511b6f4bf983a5856b766dd8213e6055fb464b7643d83c99d7636597 buildah-debugsource-1.39.9-1.el9_6.aarch64.rpm SHA-256: 5b9670c9869b9b38cbd17de0598bd0694eb10949ea3186742c4921a5fad7183b buildah-tests-1.39.9-1.el9_6.aarch64.rpm SHA-256: 5ccf060bbef55afc5620a4c01fa986bffece4e8c691e833704acd3efe40fc072 buildah-tests-debuginfo-1.39.9-1.el9_6.aarch64.rpm SHA-256: c1fc4e99011e8440abdd18d2e17ec78cb5e5dcf593fbea119c763d90a808344d Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 9.6 SRPM buildah-1.39.9-1.el9_6.src.rpm SHA-256: c00f7092d990f3ed4c292f0adfabd1bec93c4bb2f814d0064bbd6677d11ddbb2 ppc64le buildah-1.39.9-1.el9_6.ppc64le.rpm SHA-256: 2bd23ecfafc88b7567459eab8f1cbe0e39fb911fbfde5a6c79e1cbd53adf49c2 buildah-debuginfo-1.39.9-1.el9_6.ppc64le.rpm SHA-256: 17b43bbc29a9c5b5aac37eadc0f933c7dae5d01b39d28ad5afcbf15b3942f8ae buildah-debugsource-1.39.9-1.el9_6.ppc64le.rpm SHA-256: f9aa726c05d759ac6b4c7febff3913322552a9e938c3175779ae6ef0431d34a1 buildah-tests-1.39.9-1.el9_6.ppc64le.rpm SHA-256: 403073de62e03f78d6c13ab319889f89d25d76cca9a9497b611a096b8bdd1528 buildah-tests-debuginfo-1.39.9-1.el9_6.ppc64le.rpm SHA-256: 48e3d5a6500e55bc34fd0650de83a0ddfaf65a9b0b12cef6a4a1ff716583def2 Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.6 SRPM buildah-1.39.9-1.el9_6.src.rpm SHA-256: c00f7092d990f3ed4c292f0adfabd1bec93c4bb2f814d0064bbd6677d11ddbb2 x86_64 buildah-1.39.9-1.el9_6.x86_64.rpm SHA-256: 7cdc1cc704dd2a5e3412f5eaeb2267c37a1b5826468300a1fc0ec65ae07af069 buildah-debuginfo-1.39.9-1.el9_6.x86_64.rpm SHA-256: 99a4dc90176425b40589b64e391e3d92914661b2b5d84b9f217bfc764e2e18ed buildah-debugsource-1.39.9-1.el9_6.x86_64.rpm SHA-256: 099127c818731d1dabdb632e6ddc84cfbcf7e5efd7b27dd9caa3a2e1ecd3b037 buildah-tests-1.39.9-1.el9_6.x86_64.rpm SHA-256: 5ff9ba674861bcbe42e535f5504919a5ca78a7ed077637219ccbe9d6571528db buildah-tests-debuginfo-1.39.9-1.el9_6.x86_64.rpm SHA-256: a40af236932ee3e77c68a85d44e18f1d85fbb97601cb5247f4902f7837008877 Red Hat Enterprise Linux for ARM 64 - 4 years of updates 9.6 SRPM buildah-1.39.9-1.el9_6.src.rpm SHA-256: c00f7092d990f3ed4c292f0adfabd1bec93c4bb2f814d0064bbd6677d11ddbb2 aarch64 buildah-1.39.9-1.el9_6.aarch64.rpm SHA-256: 43c7685442bd5022449a0638424b7974468bb0084072e8a730cd2a593bc85ec5 buildah-debuginfo-1.39.9-1.el9_6.aarch64.rpm SHA-256: f47e7904511b6f4bf983a5856b766dd8213e6055fb464b7643d83c99d7636597 buildah-debugsource-1.39.9-1.el9_6.aarch64.rpm SHA-256: 5b9670c9869b9b38cbd17de0598bd0694eb10949ea3186742c4921a5fad7183b buildah-tests-1.39.9-1.el9_6.aarch64.rpm SHA-256: 5ccf060bbef55afc5620a4c01fa986bffece4e8c691e833704acd3efe40fc072 buildah-tests-debuginfo-1.39.9-1.el9_6.aarch64.rpm SHA-256: c1fc4e99011e8440abdd18d2e17ec78cb5e5dcf593fbea119c763d90a808344d Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 9.6 SRPM buildah-1.39.9-1.el9_6.src.rpm SHA-256: c00f7092d990f3ed4c292f0adfabd1bec93c4bb2f814d0064bbd6677d11ddbb2 s390x buildah-1.39.9-1.el9_6.s390x.rpm SHA-256: d03900291b25baff0cf6efe945b8586cc93f4fa956c82b97e4d50fdf6009db49 buildah-debuginfo-1.39.9-1.el9_6.s390x.rpm SHA-256: d