Red Hat Security Advisory: image-builder security update
A local binary for building customized OS artifacts such as VM images and OSTree commits. Uses osbuild under the hood. Security Fix(es): * crypto/x509: golang: Denial of Service due to excessive resource consumption via crafted certificate (CVE-2025-61729) * golang: net/url: Memory exhaustion in query parameter parsing in net/url (CVE-2025-61726) * crypto/tls: Unexpected session resumption in crypto/tls (CVE-2025-68121) 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.
AI Analysis
Technical Summary
The Red Hat image-builder tool, which uses osbuild to create customized OS artifacts, contains three security vulnerabilities. CVE-2025-61729 is a denial of service vulnerability caused by excessive resource consumption triggered by crafted certificates in the crypto/x509 package. CVE-2025-61726 involves memory exhaustion during query parameter parsing in the golang net/url package. CVE-2025-68121 concerns unexpected session resumption behavior in the crypto/tls package. These vulnerabilities could lead to resource exhaustion or unexpected TLS session behavior when processing crafted inputs. The advisory covers Red Hat Enterprise Linux 9 across multiple architectures and provides updated packages to fix these issues.
Potential Impact
The vulnerabilities may allow a local attacker to cause denial of service through excessive resource consumption or memory exhaustion, potentially impacting system stability. The TLS session resumption issue could lead to unexpected session behavior, which may affect secure communications. No known exploits in the wild have been reported. The overall security impact is rated as Important by Red Hat.
Mitigation Recommendations
Red Hat has released updated image-builder packages for Red Hat Enterprise Linux 9 that address these vulnerabilities. Users should apply the security update as detailed in the Red Hat advisory RHSA-2026:3839 and the referenced article https://access.redhat.com/articles/11258. The vendor manages remediation through official patches; no additional mitigation steps are required beyond applying the update.
Red Hat Security Advisory: image-builder security update
Description
A local binary for building customized OS artifacts such as VM images and OSTree commits. Uses osbuild under the hood. Security Fix(es): * crypto/x509: golang: Denial of Service due to excessive resource consumption via crafted certificate (CVE-2025-61729) * golang: net/url: Memory exhaustion in query parameter parsing in net/url (CVE-2025-61726) * crypto/tls: Unexpected session resumption in crypto/tls (CVE-2025-68121) 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
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Red Hat image-builder tool, which uses osbuild to create customized OS artifacts, contains three security vulnerabilities. CVE-2025-61729 is a denial of service vulnerability caused by excessive resource consumption triggered by crafted certificates in the crypto/x509 package. CVE-2025-61726 involves memory exhaustion during query parameter parsing in the golang net/url package. CVE-2025-68121 concerns unexpected session resumption behavior in the crypto/tls package. These vulnerabilities could lead to resource exhaustion or unexpected TLS session behavior when processing crafted inputs. The advisory covers Red Hat Enterprise Linux 9 across multiple architectures and provides updated packages to fix these issues.
Potential Impact
The vulnerabilities may allow a local attacker to cause denial of service through excessive resource consumption or memory exhaustion, potentially impacting system stability. The TLS session resumption issue could lead to unexpected session behavior, which may affect secure communications. No known exploits in the wild have been reported. The overall security impact is rated as Important by Red Hat.
Mitigation Recommendations
Red Hat has released updated image-builder packages for Red Hat Enterprise Linux 9 that address these vulnerabilities. Users should apply the security update as detailed in the Red Hat advisory RHSA-2026:3839 and the referenced article https://access.redhat.com/articles/11258. The vendor manages remediation through official patches; no additional mitigation steps are required beyond applying the update.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:3839
- Cve Count
- 3
- Additional Cves
- ["CVE-2025-61729","CVE-2025-68121"]
- State
- PUBLISHED
Threat ID: 6a160968e29bf47b5062e424
Added to database: 05/26/2026, 20:58:16 UTC
Last enriched: 08/14/2026, 19:42:06 UTC
Last updated: 09/14/2026, 10:01:28 UTC
Views: 87
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