RHSA-2026:36199HighCVSS 8.7

Red Hat Security Advisory: buildah security update

Published
July 7, 2026
Last Modified
September 29, 2026

🔗 CVE IDs covered (4)

CVE-2026-39835 →CVE-2026-39829 →CVE-2026-39830 →CVE-2026-39832 →

📋 Description

CVE-2026-39829 — golang.org/x/crypto/ssh: golang.org/x/crypto/ssh: Denial of Service via crafted public key with excessive parameters CVE-2026-39830 — golang.org/x/crypto/ssh: golang.org/x/crypto/ssh: Denial of Service via resource leak from unsolicited SSH responses CVE-2026-39832 — golang.org/x/crypto/ssh/agent: golang.org/x/crypto/ssh/agent: Security bypass due to improper handling of key restrictions CVE-2026-39835 — golang.org/x/crypto/ssh: golang: golang.org/x/crypto/ssh: Denial of Service via crafted SSH certificate

🎯 Affected products22

  • Red Hat Enterprise Linux AppStream (v. 10)
  • buildah-2:1.43.1-3.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • buildah-2:1.43.1-3.el10_2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • buildah-2:1.43.1-3.el10_2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • buildah-2:1.43.1-3.el10_2.src as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • buildah-2:1.43.1-3.el10_2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • buildah-debuginfo-2:1.43.1-3.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • buildah-debuginfo-2:1.43.1-3.el10_2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • buildah-debuginfo-2:1.43.1-3.el10_2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • buildah-debuginfo-2:1.43.1-3.el10_2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • buildah-debugsource-2:1.43.1-3.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • buildah-debugsource-2:1.43.1-3.el10_2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • buildah-debugsource-2:1.43.1-3.el10_2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • buildah-debugsource-2:1.43.1-3.el10_2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • buildah-tests-2:1.43.1-3.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • buildah-tests-2:1.43.1-3.el10_2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • buildah-tests-2:1.43.1-3.el10_2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • buildah-tests-2:1.43.1-3.el10_2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • buildah-tests-debuginfo-2:1.43.1-3.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • buildah-tests-debuginfo-2:1.43.1-3.el10_2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • buildah-tests-debuginfo-2:1.43.1-3.el10_2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • buildah-tests-debuginfo-2:1.43.1-3.el10_2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10)

✅ Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability. Workaround: To mitigate this denial of service vulnerability, restrict network access to any service that utilizes the `golang.org/x/crypto/ssh` library and is exposed to untrusted networks. Implement firewall rules to allow connections only from trusted hosts or networks. This action limits the ability of malicious peers to send unsolicited global request responses. A restart of the affected service may be necessary for the new network rules to be applied effectively.

🔗 References (7)