Red Hat Updates RHEL 8.4 Image Builder Dependencies
Tech GuruQuick Answer
Check osbuild-composer on RHEL 8.4 Advanced Mission Critical Update Support and Extended Update Support Long-Life Add-On. Apply RHSA-2026:96076 from the matching entitled repository. Restart updated composer services in an approved window and test a representative image build, TLS connection and artifact delivery.
Confirm Scope And Apply The Supported Remediation
What to do now: Record image-building hosts, composer services, build API access and the entitled RHEL 8.4 repositories. RHEL 8.4 Advanced Mission Critical Update Support and Extended Update Support Long-Life Add-On: installations of the osbuild-composer packages requiring RHSA-2026:96076. Match the full installed RPM, architecture and repository to the vendor product tree; a universal upstream version range is not stated. Apply RHSA-2026:96076 through the entitled Red Hat repositories. The fixed source build is osbuild-composer-0:28.7-7.el8_4. Install the matching binary packages for the supported stream and architecture. Restart updated composer services in an approved window and test a representative image build, TLS connection and artifact delivery.
Last verified: 2026-11-09 UTC. Recheck the authoritative advisory and supported distribution channel before changing production.
Scope And Authority
| Product scope | RHEL 8.4 Advanced Mission Critical Update Support and Extended Update Support Long-Life Add-On; osbuild-composer |
|---|---|
| Advisory | RHSA-2026:96076 |
| CVEs | CVE-2025-68121, CVE-2026-32280, CVE-2026-32281, CVE-2026-33810, CVE-2026-33818, CVE-2026-39821, CVE-2026-42504, CVE-2026-55677, CVE-2026-56853, CVE-2026-56858, CVE-2026-56859, CVE-2026-56860, CVE-2026-56862, CVE-2026-78667, CVE-2026-78669, CVE-2026-94440, CVE-2026-97031 |
| Authoritative release date | November 9, 2026 at 01:45:39 UTC, from Red Hat CSAF initial_release_date. |
| Authority revision date | Red Hat records the substantive last-updated version at 2026-11-09T01:45:39+00:00. The CSAF generation timestamp is 2026-11-09T02:23:03+00:00; generation alone is not a material advisory revision. |
| Affected versions | RHEL 8.4 Advanced Mission Critical Update Support and Extended Update Support Long-Life Add-On: installations of the osbuild-composer packages requiring RHSA-2026:96076. Match the full installed RPM, architecture and repository to the vendor product tree; a universal upstream version range is not stated. |
| Fixed version | osbuild-composer-0:28.7-7.el8_4 |
| CVSS base score | 8.8 (highest authority-stated CVSS 3.1 base score) |
| CVSS severity | High (CVSS); Important (Red Hat impact) |
| Exploitation status | Red Hat does not state exploitation in this advisory.; no exploitation claim is inferred. |
Authority CVSS by Vulnerability
| CVE-2025-68121 | CVSS 3.1: 7.4 (High) |
|---|---|
| CVE-2026-32280 | CVSS 3.1: 7.5 (High) |
| CVE-2026-32281 | CVSS 3.1: 5.9 (Medium) |
| CVE-2026-33810 | CVSS 3.1: 8.8 (High) |
| CVE-2026-33818 | CVSS 3.1: 7.5 (High) |
| CVE-2026-39821 | CVSS 3.1: 8.2 (High) |
| CVE-2026-42504 | CVSS 3.1: 7.5 (High) |
| CVE-2026-55677 | CVSS 3.1: 7.5 (High) |
| CVE-2026-56853 | CVSS 3.1: 7.5 (High) |
| CVE-2026-56858 | CVSS 3.1: 8.1 (High) |
| CVE-2026-56859 | CVSS 3.1: 7.5 (High) |
| CVE-2026-56860 | CVSS 3.1: 7.5 (High) |
| CVE-2026-56862 | CVSS 3.1: 7.5 (High) |
| CVE-2026-78667 | CVSS 3.1: 7.5 (High) |
| CVE-2026-78669 | CVSS 3.1: 7.5 (High) |
| CVE-2026-94440 | CVSS 3.1: 7.5 (High) |
| CVE-2026-97031 | CVSS 3.1: 7.5 (High) |
What Changed
Red Hat released RHSA-2026:96076 for RHEL 8.4 Advanced Mission Critical Update Support and Extended Update Support Long-Life Add-On, addressing certificate validation, HTTP processing, MIME handling and other Go/Echo dependency flaws. The update provides the distribution packages listed below; keep the Red Hat release and support channel matched during remediation.
What To Validate Now
- Inventory. Record image-building hosts, composer services, build API access and the entitled RHEL 8.4 repositories.
- Establish applicability. RHEL 8.4 Advanced Mission Critical Update Support and Extended Update Support Long-Life Add-On: installations of the osbuild-composer packages requiring RHSA-2026:96076. Match the full installed RPM, architecture and repository to the vendor product tree; a universal upstream version range is not stated.
- Remediate. Apply RHSA-2026:96076 through the entitled Red Hat repositories. The fixed source build is osbuild-composer-0:28.7-7.el8_4. Install the matching binary packages for the supported stream and architecture.
- Validate. Restart updated composer services in an approved window and test a representative image build, TLS connection and artifact delivery.
- Retain evidence. Preserve asset and owner identifiers, the applicability decision, before-and-after versions, change approval, installation output, validation results, and any exception or rollback record.
Operational Cautions
Review service input and network trust boundaries while arranging the update. A Go toolchain update alone does not replace the affected packaged application.
Evidence To Retain
- Exact product, release stream, package or application version, enabled feature, environment, and accountable owner.
- UTC timestamps, authority revision, approved change record, installer or package-manager output, and resulting version.
- Relevant logs and monitoring evidence, test results, exceptions, compensating controls, and rollback decisions.
Related TechGeeks Resources
Authoritative References
Correction policy: If the authority changes affected versions, fixed versions, severity, exploitation information, mitigations, or required action, TechGeeks will update this notice and its verification date.
Advisory facts are attributed to Red Hat Inc. The linked CSAF content is licensed under CC BY 4.0; TechGeeks operational guidance is summarized for this notice.
