RHSA-2026:49838: Important: osbuild-composer security, bug fix, and enhancement update

Published Aug 4, 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) Bug Fix(es) and Enhancement(s): bootupctl backend install --auto fails bootupd EFI metadata missing (JIRA:RHEL-185745) 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.

Other sources

Important: osbuild-composer security, bug fix, and enhancement update

— Red Hat

Affected Software

48 affected componentsFixes available
Red Hat Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions
Red Hat Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle
Red Hat Red Hat Enterprise Linux for Power, little endian
Red Hat Red Hat Enterprise Linux for ARM 64 - 4 years of updates
Red Hat Red Hat Enterprise Linux for x86_64
Red Hat Red Hat Enterprise Linux for IBM z Systems
Red Hat Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Red Hat Enterprise Linux for IBM z Systems - 4 years of updates
Red Hat Red Hat Enterprise Linux for x86_64 - Extended Life Cycle
Red Hat Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle
Red Hat Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
Red Hat Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle
Red Hat Red Hat Enterprise Linux for ARM 64
Red Hat Red Hat Enterprise Linux for ARM 64 - Extended Update Support
redhat/osbuild-composer<165.1-4.el9_8
165.1-4.el9_8
redhat/osbuild-composer<165.1-4.el9_8
165.1-4.el9_8
redhat/osbuild-composer-core<165.1-4.el9_8
165.1-4.el9_8
redhat/osbuild-composer-core-debuginfo<165.1-4.el9_8
165.1-4.el9_8
redhat/osbuild-composer-debuginfo<165.1-4.el9_8
165.1-4.el9_8
redhat/osbuild-composer-debugsource<165.1-4.el9_8
165.1-4.el9_8
redhat/osbuild-composer-tests-debuginfo<165.1-4.el9_8
165.1-4.el9_8
redhat/osbuild-composer-worker<165.1-4.el9_8
165.1-4.el9_8
redhat/osbuild-composer-worker-debuginfo<165.1-4.el9_8
165.1-4.el9_8
redhat/osbuild-composer-core<165.1-4.el9_8
165.1-4.el9_8
redhat/osbuild-composer-core-debuginfo<165.1-4.el9_8
165.1-4.el9_8
redhat/osbuild-composer-debuginfo<165.1-4.el9_8
165.1-4.el9_8
redhat/osbuild-composer-debugsource<165.1-4.el9_8
165.1-4.el9_8
redhat/osbuild-composer-tests-debuginfo<165.1-4.el9_8
165.1-4.el9_8
redhat/osbuild-composer-worker<165.1-4.el9_8
165.1-4.el9_8
redhat/osbuild-composer-worker-debuginfo<165.1-4.el9_8
165.1-4.el9_8
redhat/osbuild-composer<165.1-4.el9_8
165.1-4.el9_8
redhat/osbuild-composer-core<165.1-4.el9_8
165.1-4.el9_8
redhat/osbuild-composer-core-debuginfo<165.1-4.el9_8
165.1-4.el9_8
redhat/osbuild-composer-debuginfo<165.1-4.el9_8
165.1-4.el9_8
redhat/osbuild-composer-debugsource<165.1-4.el9_8
165.1-4.el9_8
redhat/osbuild-composer-tests-debuginfo<165.1-4.el9_8
165.1-4.el9_8
redhat/osbuild-composer-worker<165.1-4.el9_8
165.1-4.el9_8
redhat/osbuild-composer-worker-debuginfo<165.1-4.el9_8
165.1-4.el9_8
redhat/osbuild-composer<165.1-4.el9_8.aa
165.1-4.el9_8.aa
redhat/osbuild-composer-core<165.1-4.el9_8.aa
165.1-4.el9_8.aa
redhat/osbuild-composer-core-debuginfo<165.1-4.el9_8.aa
165.1-4.el9_8.aa
redhat/osbuild-composer-debuginfo<165.1-4.el9_8.aa
165.1-4.el9_8.aa
redhat/osbuild-composer-debugsource<165.1-4.el9_8.aa
165.1-4.el9_8.aa
redhat/osbuild-composer-tests-debuginfo<165.1-4.el9_8.aa
165.1-4.el9_8.aa
redhat/osbuild-composer-worker<165.1-4.el9_8.aa
165.1-4.el9_8.aa
redhat/osbuild-composer-worker-debuginfo<165.1-4.el9_8.aa
165.1-4.el9_8.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 165.1-4.el9_8
  2. Upgrade

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

    Fixed in 165.1-4.el9_8
  3. Upgrade

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

    Fixed in 165.1-4.el9_8
  4. Upgrade

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

    Fixed in 165.1-4.el9_8
  5. Upgrade

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

    Fixed in 165.1-4.el9_8
  6. Upgrade

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

    Fixed in 165.1-4.el9_8
  7. Upgrade

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

    Fixed in 165.1-4.el9_8
  8. Upgrade

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

    Fixed in 165.1-4.el9_8
  9. Upgrade

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

    Fixed in 165.1-4.el9_8.aa
  10. Upgrade

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

    Fixed in 165.1-4.el9_8.aa
  11. Upgrade

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

    Fixed in 165.1-4.el9_8.aa
  12. Upgrade

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

    Fixed in 165.1-4.el9_8.aa
  13. Upgrade

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

    Fixed in 165.1-4.el9_8.aa
  14. Upgrade

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

    Fixed in 165.1-4.el9_8.aa
  15. Upgrade

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

    Fixed in 165.1-4.el9_8.aa
  16. Upgrade

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

    Fixed in 165.1-4.el9_8.aa
  17. Upgrade

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

    Patch RHEL-185745
  18. Upgrade

    Upgrade crypto/x509, golang to a version that resolves this vulnerability.

    Patch CVE-2026-32281

Event History

Aug 4, 2026
Advisory Published
via Red Hat·12:00 AM
Data Sourced
via Red Hat·12:00 AM
RemedyDescriptionAffected Software
Advisory Published
via Red Hat·12:09 AM
Data Sourced
via Red Hat·12:09 AM
Severity
Free Weekly Intel

Don't miss critical vulnerabilities

Join thousands of security professionals who receive our weekly digest of trending CVEs, zero-days, and exploited vulnerabilities.

No spam. Unsubscribe anytime.

Frequently Asked Questions

1

What is the severity of RHSA-2026:49838?

The severity of RHSA-2026:49838 is classified as high, with a score of 7.

2

What are the main components affected by RHSA-2026:49838?

The main components affected by RHSA-2026:49838 include redhat/osbuild-composer and its related packages.

3

How do I fix RHSA-2026:49838?

To fix RHSA-2026:49838, you should update your osbuild-composer packages to the latest version as recommended by your system administrator.

4

What vulnerabilities does RHSA-2026:49838 address?

RHSA-2026:49838 addresses security issues related to the crypto/x509 functionality.

5

What functionality does osbuild-composer provide as mentioned in RHSA-2026:49838?

osbuild-composer provides a service for building customized OS artifacts, including VM images and OSTree commits.

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2026 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203