Red Hat Security Advisory: osbuild-composer security update
Red Hat has issued a security advisory for osbuild-composer, a service used to build customized OS artifacts including VM images and OSTree commits. The advisory addresses two vulnerabilities in underlying Golang components: CVE-2025-61729, a denial of service caused by excessive resource consumption via a crafted certificate in crypto/x509, and CVE-2025-61726, a memory exhaustion issue in query parameter parsing in net/url. These vulnerabilities could lead to denial of service conditions. The update is rated as Important by Red Hat Product Security. Patches are available for affected Red Hat Enterprise Linux 8. 6 variants. No known exploits are reported in the wild at this time.
AI Analysis
Technical Summary
The osbuild-composer service in Red Hat Enterprise Linux 8.6 and related variants has been updated to fix two security vulnerabilities originating from Golang libraries. CVE-2025-61729 involves a denial of service via crafted certificates causing excessive resource consumption in the crypto/x509 package. CVE-2025-61726 involves memory exhaustion during query parameter parsing in the net/url package. These issues could be exploited to cause denial of service conditions in the osbuild-composer service. Red Hat has released updated packages to remediate these vulnerabilities as part of advisory RHSA-2026:5853.
Potential Impact
Successful exploitation of these vulnerabilities could cause denial of service by exhausting system resources, impacting availability of the osbuild-composer service. This could disrupt the building and uploading of customized OS artifacts such as VM images. There are no reports of active exploitation in the wild. The impact is limited to denial of service and does not indicate code execution or data compromise.
Mitigation Recommendations
Red Hat has released updated osbuild-composer packages for Red Hat Enterprise Linux 8.6 variants that address these vulnerabilities. Users should apply the security update as detailed in Red Hat advisory RHSA-2026:5853 and the referenced article https://access.redhat.com/articles/11258 to remediate the issues. No additional mitigation is indicated by the vendor advisory.
Red Hat Security Advisory: osbuild-composer security update
Description
Red Hat has issued a security advisory for osbuild-composer, a service used to build customized OS artifacts including VM images and OSTree commits. The advisory addresses two vulnerabilities in underlying Golang components: CVE-2025-61729, a denial of service caused by excessive resource consumption via a crafted certificate in crypto/x509, and CVE-2025-61726, a memory exhaustion issue in query parameter parsing in net/url. These vulnerabilities could lead to denial of service conditions. The update is rated as Important by Red Hat Product Security. Patches are available for affected Red Hat Enterprise Linux 8. 6 variants. No known exploits are reported in the wild at this time.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The osbuild-composer service in Red Hat Enterprise Linux 8.6 and related variants has been updated to fix two security vulnerabilities originating from Golang libraries. CVE-2025-61729 involves a denial of service via crafted certificates causing excessive resource consumption in the crypto/x509 package. CVE-2025-61726 involves memory exhaustion during query parameter parsing in the net/url package. These issues could be exploited to cause denial of service conditions in the osbuild-composer service. Red Hat has released updated packages to remediate these vulnerabilities as part of advisory RHSA-2026:5853.
Potential Impact
Successful exploitation of these vulnerabilities could cause denial of service by exhausting system resources, impacting availability of the osbuild-composer service. This could disrupt the building and uploading of customized OS artifacts such as VM images. There are no reports of active exploitation in the wild. The impact is limited to denial of service and does not indicate code execution or data compromise.
Mitigation Recommendations
Red Hat has released updated osbuild-composer packages for Red Hat Enterprise Linux 8.6 variants that address these vulnerabilities. Users should apply the security update as detailed in Red Hat advisory RHSA-2026:5853 and the referenced article https://access.redhat.com/articles/11258 to remediate the issues. No additional mitigation is indicated by the vendor advisory.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:5853
- Cve Count
- 2
- Additional Cves
- ["CVE-2025-61729"]
- Cvss Version
- null
Threat ID: 6a160964e29bf47b50629c45
Added to database: 5/26/2026, 8:58:12 PM
Last enriched: 5/26/2026, 9:29:10 PM
Last updated: 5/27/2026, 4:49:48 AM
Views: 2
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