This update for Buildah on RHEL 9.4 addresses multiple high-severity Denial of Service vulnerabilities (CVSS 7.5) in its underlying Go components, including flaws in go-jose and crypto/x509/tls that can be triggered via crafted JWE objects, inefficient certificate chain validation, or excessive TLS key update messages. The vulnerabilities affect go-jose versions 3.0.0-3.0.4 and 4.0.0-4.1.3, and Go versions prior to 1.25.9 or 1.26.0-1.26.1. The fix is contained within the updated buildah package for the listed RHEL channels, which incorporates the patched libraries go-jose v3.0.5 / v4.1.4 and Go 1.25.9 / 1.26.2.
Red Hat Product Errata RHSA-2026:34192 - Security Advisory Issued: 2026-07-01 Updated: 2026-07-01 RHSA-2026:34192 - Security Advisory Overview Updated Packages Synopsis Important: buildah security, bug fix, and enhancement 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 9.4 Update Services for SAP Solutions. 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/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) Bug Fix(es) and Enhancement(s): [RHEL 9.4] Buildah specfile missing dumpspec test binary (JIRA:RHEL-170385) 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 - AUS 9.4 x86_64 Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 9.4 ppc64le Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.4 x86_64 Red Hat Enterprise Linux for ARM 64 - 4 years of updates 9.4 aarch64 Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 9.4 s390x Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 9.4 x86_64 Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle 9.4 aarch64 Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle 9.4 ppc64le Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle 9.4 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 - 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 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 Server - AUS 9.4 SRPM buildah-1.33.15-1.el9_4.1.src.rpm SHA-256: 45cec6d093faf58afd470b76d7d55d6dfbe538e56994588601871dd9ca42d5bd x86_64 buildah-1.33.15-1.el9_4.1.x86_64.rpm SHA-256: 7788c0522e1857dc7c4faff84775c9da6ee518f12bf4de19ca3ad30eba3bfd53 buildah-debuginfo-1.33.15-1.el9_4.1.x86_64.rpm SHA-256: cd73e9645d85fe745b62dd69328aa2d8d1a8dc6adb6fd80b3ca3949e25d7eb50 buildah-debugsource-1.33.15-1.el9_4.1.x86_64.rpm SHA-256: f75ca72eb6c3687281023e3a45a8654084373de36f6365cac488588d110efaa7 buildah-tests-1.33.15-1.el9_4.1.x86_64.rpm SHA-256: f6a1a357fac1378a5ed4a6bf34ee3f0e456cef3f6e9052e379812503cccc18b1 buildah-tests-debuginfo-1.33.15-1.el9_4.1.x86_64.rpm SHA-256: 12cbc8fc63d4fa1aef0a1cbe39c35b71562c900fd59a54623bfe9e992071292d Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 9.4 SRPM buildah-1.33.15-1.el9_4.1.src.rpm SHA-256: 45cec6d093faf58afd470b76d7d55d6dfbe538e56994588601871dd9ca42d5bd ppc64le buildah-1.33.15-1.el9_4.1.ppc64le.rpm SHA-256: db6febab8cb870606e129abde6bb634737cef43a3174510805920e8f21d024a2 buildah-debuginfo-1.33.15-1.el9_4.1.ppc64le.rpm SHA-256: a278acab213a681164fd795d3bfd70d3b6cca959e0e76abbbcd4b0f5c5026778 buildah-debugsource-1.33.15-1.el9_4.1.ppc64le.rpm SHA-256: 7091179c7ee8d46fdff7dc28c7e04d75a20db9540dfc1899e8e0c7dc370b3a1d buildah-tests-1.33.15-1.el9_4.1.ppc64le.rpm SHA-256: 238a90e1a1ce62fa65bc09b924dbe1f433fc0d08c028c9dd24c352dfa5bd8f2d buildah-tests-debuginfo-1.33.15-1.el9_4.1.ppc64le.rpm SHA-256: 87ba98f88d3e48641b038fde9d755fe84079534bd47221bbbbc08f5bf96a0de3 Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.4 SRPM buildah-1.33.15-1.el9_4.1.src.rpm SHA-256: 45cec6d093faf58afd470b76d7d55d6dfbe538e56994588601871dd9ca42d5bd x86_64 buildah-1.33.15-1.el9_4.1.x86_64.rpm SHA-256: 7788c0522e1857dc7c4faff84775c9da6ee518f12bf4de19ca3ad30eba3bfd53 buildah-debuginfo-1.33.15-1.el9_4.1.x86_64.rpm SHA-256: cd73e9645d85fe745b62dd69328aa2d8d1a8dc6adb6fd80b3ca3949e25d7eb50 buildah-debugsource-1.33.15-1.el9_4.1.x86_64.rpm SHA-256: f75ca72eb6c3687281023e3a45a8654084373de36f6365cac488588d110efaa7 buildah-tests-1.33.15-1.el9_4.1.x86_64.rpm SHA-256: f6a1a357fac1378a5ed4a6bf34ee3f0e456cef3f6e9052e379812503cccc18b1 buildah-tests-debuginfo-1.33.15-1.el9_4.1.x86_64.rpm SHA-256: 12cbc8fc63d4fa1aef0a1cbe39c35b71562c900fd59a54623bfe9e992071292d Red Hat Enterprise Linux for ARM 64 - 4 years of updates 9.4 SRPM buildah-1.33.15-1.el9_4.1.src.rpm SHA-256: 45cec6d093faf58afd470b76d7d55d6dfbe538e56994588601871dd9ca42d5bd aarch64 buildah-1.33.15-1.el9_4.1.aarch64.rpm SHA-256: 4d61fcbf14efec5da4b27b3513dcf502af445f61e36eae51fc253a71a9e26ef7 buildah-debuginfo-1.33.15-1.el9_4.1.aarch64.rpm SHA-256: 7b1a06c80677e94fddaffa3bedf6b8b027ebc49057a7c2f4dc43f57b0db55c58 buildah-debugsource-1.33.15-1.el9_4.1.aarch64.rpm SHA-256: d65fa3fde7bd4f5406715eec9c99d735154939bc3567213d30a5f0289623d011 buildah-tests-1.33.15-1.el9_4.1.aarch64.rpm SHA-256: b6f099f74f1cddd2cc424910074b5bb1a93153dccb09448fcbc2d1d6af8c9367 buildah-tests-debuginfo-1.33.15-1.el9_4.1.aarch64.rpm SHA-256: b29c5f11c7a1c16e15b86fe0bcd709fc1f6804f192c31f82c1fcf149d4f4d7f5 Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 9.4 SRPM buildah-1.33.15-1.el9_4.1.src.rpm SHA-256: 45cec6d093faf58afd470b76d7d55d6dfbe538e56994588601871dd9ca42d5bd s390x buildah-1.33.15-1.el9_4.1.s390x.rpm SHA-256: af990f457aec3cbddda85fc447c40eff4947dafa008ab48f9ee48ed60a1a2691 buildah-debuginfo-1.33.15-1.el9_4.1.s390x.rpm SHA-256: cc492d6fea9d54fd2fb04800ca5ddaec48f5726d4f43735be387326c4d3205a6 buildah-debugsource-1.33.15-1.el9_4.1.s390x.rpm SHA-256: 8341295185df8f1e35910a58b191516c77519ed52690cc1f274abc457d45c6f3 buildah-tests-1.33.15-1.el9_4.1.s390x.rpm SHA-256: c9a875eedb13771126e1cfad492d2773cd457c39fac4d6f8e778591560f6a3f9 buildah-tests-debuginfo-1.33.15-1.el9_4.1.s390x.rpm SHA-256: 7edef2cca4cfc6caa6177e6a224cabf747ba9b59292eea979caf3a0f1864c9c3 Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 9.4 SRPM buildah-1.33.15-1.el9_4.1.src.rpm SHA-256: 45cec6d093faf58afd470b76d7d55d6dfbe538e56994588601871dd9ca42d5bd x86_64 buildah-1.33.15-1.el9_4.1.x86_64.rpm SHA-256: 7788c0522e1857dc7c4faff84775c9da6ee518f12bf4de19ca3ad30eba3bfd53 buildah-debuginfo-1.33.15-1.el9_4.1.x86_64.rpm SHA-256: cd73e9645d85fe745b62dd69328aa2d8d1a8dc6adb6fd80b3ca3949e25d7eb50 buildah-debugsource-1.33.15-1.el9_4.1.x86_64.rpm SHA-256: f75ca72eb6c3687281023e3a45a8654084373de36f6365cac488588d110efaa7 buildah-tests-1.33.15-1.el9_4.1.x86_64.rpm SHA-256: f6a1a357fac1378a5ed4a6bf34ee3f0e456cef3f6e9052e379812503cccc18b1 buildah-tests-debuginfo-1.33.15-1.el9_4.1.x86_64.rpm SHA-256: 12cbc8fc63d4fa1aef0a1cbe39c35b71562c900fd59a54623bfe9e992071292d Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle 9.4 SRPM buildah-1.33.15-1.el9_4.1.src.rpm SHA-256: 45cec6d093faf58afd470b76d7d55d6dfbe538e56994588601871dd9ca42d5bd aarch64 buildah-1.33.15-1.el9_4.1.aarch64.rpm SHA-256: 4d61fcbf14efec5da4b27b3513dcf502af445f61e36eae51fc253a71a9e26ef7 buildah-debuginfo-1.33.15-1.el9_4.1.aarch64.rpm SHA-256: 7b1a06c80677e94fddaffa3bedf6b8b027ebc49057a7c2f4dc43f57b0db55c58 buildah-debugsource-1.33.15-1.el9_4.1.aarch64.rpm SHA-256: d65fa3fde7bd4f5406715eec9c99d735154939bc3567213d30a5f0289623d011 buildah-tests-1.33.15-1.el9_4.1.aarch64.rpm SHA-256: b6f099f74f1cddd2cc424910074b5bb1a93153dccb09448fcbc2d1d6af8c9367 buildah-tests-debuginfo-1.33.15-1.el9_4.1.aarch64.rpm SHA-256: b29c5f11c7a1c16e15b86fe0bcd709fc1f6804f192c31f82c1fcf149d4f4d7f5 Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle 9.4 SRPM buildah-1.33.15-1.el9_4.1.src.rpm SHA-256: 45cec6d093faf58afd470b76d7d55d6dfbe538e56994588601871dd9ca42d5bd ppc64le buildah-1.33.15-1.el9_4.1.ppc64le.rpm SHA-256: db6febab8cb870606e129abde6bb634737cef43a3174510805920e8f21d024a2 buildah-debuginfo-1.33.15-1.el9_4.1.ppc64le.rpm SHA-256: a278acab213a681164fd795d3bfd70d3b6cca959e0e76abbbcd4b0f5c5026778 buildah-debugsource-1.33.15-1.el9_4.1.ppc64le.rpm SHA-256: 7091179c7ee8d46fdff7dc28c7e04d75a20db9540dfc1899e8e0c7dc370b3a1d buildah-tests-1.33.15-1.el9_4.1.ppc64le.rpm SHA-256: 238a90e1a1ce62fa65bc09b924dbe1f433fc0d08c028c9dd24c352dfa5bd8f2d buildah-tests-debuginfo-1.33.15-1.el9_4.1.ppc64le.rpm SHA-256: 87ba98f88d3e48641b038fde9d755fe84079534bd47221bbbbc08f5bf96a0de3 Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle 9.4 SRPM buildah-1.33.15-1.el9_4.1.src.rpm SHA-256: 45cec6d0