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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Frequently Asked Questions

1

What is the impact of RHSA-2026:49526?

RHSA-2026:49526 addresses security vulnerabilities in osbuild-composer that could potentially allow unauthorized access to sensitive data.

2

How do I mitigate the risks associated with RHSA-2026:49526?

To mitigate the risks, it is recommended to apply the latest security update for osbuild-composer as soon as possible.

3

What versions of software are affected by RHSA-2026:49526?

The affected software versions include redhat/osbuild-composer, redhat/osbuild-composer-core, and related packages.

4

Is there a workaround for RHSA-2026:49526 until I can apply the update?

Currently, there is no documented workaround for RHSA-2026:49526, and it is advised to update to the patched version.

5

What type of vulnerabilities does RHSA-2026:49526 address?

RHSA-2026:49526 addresses vulnerabilities related to cryptographic functions in the osbuild-composer service.

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