RHSA-2026:49526: Important: osbuild-composer security update

Published Aug 3, 2026
·
Updated

A service for building customized OS artifacts, such as VM images and OSTree commits, that uses osbuild under the hood. Besides building images for local usage, it can also upload images directly to cloud. It is compatible with composer-cli and cockpit-composer clients.Security Fix(es): crypto/x509: golang: Go crypto/x509: Denial of Service via inefficient certificate chain validation (CVE-2026-32281) 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.

Affected Software

32 affected componentsFixes available
redhat/osbuild-composer<165.1-3.el10_2.1
165.1-3.el10_2.1
redhat/osbuild-composer<165.1-3.el10_2.1
165.1-3.el10_2.1
redhat/osbuild-composer-core<165.1-3.el10_2.1
165.1-3.el10_2.1
redhat/osbuild-composer-core-debuginfo<165.1-3.el10_2.1
165.1-3.el10_2.1
redhat/osbuild-composer-debuginfo<165.1-3.el10_2.1
165.1-3.el10_2.1
redhat/osbuild-composer-debugsource<165.1-3.el10_2.1
165.1-3.el10_2.1
redhat/osbuild-composer-tests-debuginfo<165.1-3.el10_2.1
165.1-3.el10_2.1
redhat/osbuild-composer-worker<165.1-3.el10_2.1
165.1-3.el10_2.1
redhat/osbuild-composer-worker-debuginfo<165.1-3.el10_2.1
165.1-3.el10_2.1
redhat/osbuild-composer-core<165.1-3.el10_2.1
165.1-3.el10_2.1
redhat/osbuild-composer-core-debuginfo<165.1-3.el10_2.1
165.1-3.el10_2.1
redhat/osbuild-composer-debuginfo<165.1-3.el10_2.1
165.1-3.el10_2.1
redhat/osbuild-composer-debugsource<165.1-3.el10_2.1
165.1-3.el10_2.1
redhat/osbuild-composer-tests-debuginfo<165.1-3.el10_2.1
165.1-3.el10_2.1
redhat/osbuild-composer-worker<165.1-3.el10_2.1
165.1-3.el10_2.1
redhat/osbuild-composer-worker-debuginfo<165.1-3.el10_2.1
165.1-3.el10_2.1
redhat/osbuild-composer<165.1-3.el10_2.1
165.1-3.el10_2.1
redhat/osbuild-composer-core<165.1-3.el10_2.1
165.1-3.el10_2.1
redhat/osbuild-composer-core-debuginfo<165.1-3.el10_2.1
165.1-3.el10_2.1
redhat/osbuild-composer-debuginfo<165.1-3.el10_2.1
165.1-3.el10_2.1
redhat/osbuild-composer-debugsource<165.1-3.el10_2.1
165.1-3.el10_2.1
redhat/osbuild-composer-tests-debuginfo<165.1-3.el10_2.1
165.1-3.el10_2.1
redhat/osbuild-composer-worker<165.1-3.el10_2.1
165.1-3.el10_2.1
redhat/osbuild-composer-worker-debuginfo<165.1-3.el10_2.1
165.1-3.el10_2.1
redhat/osbuild-composer<165.1-3.el10_2.1.aa
165.1-3.el10_2.1.aa
redhat/osbuild-composer-core<165.1-3.el10_2.1.aa
165.1-3.el10_2.1.aa
redhat/osbuild-composer-core-debuginfo<165.1-3.el10_2.1.aa
165.1-3.el10_2.1.aa
redhat/osbuild-composer-debuginfo<165.1-3.el10_2.1.aa
165.1-3.el10_2.1.aa
redhat/osbuild-composer-debugsource<165.1-3.el10_2.1.aa
165.1-3.el10_2.1.aa
redhat/osbuild-composer-tests-debuginfo<165.1-3.el10_2.1.aa
165.1-3.el10_2.1.aa
redhat/osbuild-composer-worker<165.1-3.el10_2.1.aa
165.1-3.el10_2.1.aa
redhat/osbuild-composer-worker-debuginfo<165.1-3.el10_2.1.aa
165.1-3.el10_2.1.aa

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade redhat/osbuild-composer to a version that resolves this vulnerability.

    Fixed in 165.1-3.el10_2.1
  2. Upgrade

    Upgrade redhat/osbuild-composer-core to a version that resolves this vulnerability.

    Fixed in 165.1-3.el10_2.1
  3. Upgrade

    Upgrade redhat/osbuild-composer-core-debuginfo to a version that resolves this vulnerability.

    Fixed in 165.1-3.el10_2.1
  4. Upgrade

    Upgrade redhat/osbuild-composer-debuginfo to a version that resolves this vulnerability.

    Fixed in 165.1-3.el10_2.1
  5. Upgrade

    Upgrade redhat/osbuild-composer-debugsource to a version that resolves this vulnerability.

    Fixed in 165.1-3.el10_2.1
  6. Upgrade

    Upgrade redhat/osbuild-composer-tests-debuginfo to a version that resolves this vulnerability.

    Fixed in 165.1-3.el10_2.1
  7. Upgrade

    Upgrade redhat/osbuild-composer-worker to a version that resolves this vulnerability.

    Fixed in 165.1-3.el10_2.1
  8. Upgrade

    Upgrade redhat/osbuild-composer-worker-debuginfo to a version that resolves this vulnerability.

    Fixed in 165.1-3.el10_2.1
  9. Upgrade

    Upgrade redhat/osbuild-composer to a version that resolves this vulnerability.

    Fixed in 165.1-3.el10_2.1.aa
  10. Upgrade

    Upgrade redhat/osbuild-composer-core to a version that resolves this vulnerability.

    Fixed in 165.1-3.el10_2.1.aa
  11. Upgrade

    Upgrade redhat/osbuild-composer-core-debuginfo to a version that resolves this vulnerability.

    Fixed in 165.1-3.el10_2.1.aa
  12. Upgrade

    Upgrade redhat/osbuild-composer-debuginfo to a version that resolves this vulnerability.

    Fixed in 165.1-3.el10_2.1.aa
  13. Upgrade

    Upgrade redhat/osbuild-composer-debugsource to a version that resolves this vulnerability.

    Fixed in 165.1-3.el10_2.1.aa
  14. Upgrade

    Upgrade redhat/osbuild-composer-tests-debuginfo to a version that resolves this vulnerability.

    Fixed in 165.1-3.el10_2.1.aa
  15. Upgrade

    Upgrade redhat/osbuild-composer-worker to a version that resolves this vulnerability.

    Fixed in 165.1-3.el10_2.1.aa
  16. Upgrade

    Upgrade redhat/osbuild-composer-worker-debuginfo to a version that resolves this vulnerability.

    Fixed in 165.1-3.el10_2.1.aa

Event History

Aug 3, 2026
Advisory Published
via Red Hat·12:00 AM
Data Sourced
via Red Hat·12:00 AM
RemedyDescriptionAffected Software
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