Red Hat Security Advisory: osbuild-composer security update
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/tls: Unexpected session resumption in crypto/tls (CVE-2025-68121) * net/url: Incorrect parsing of IPv6 host literals in net/url (CVE-2026-25679) 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 vulnerability (CVE-2025-68121) exists in the crypto/tls component used by Red Hat products such as OpenShift Container Platform. It occurs during TLS session resumption when the certificate authority (CA) settings are changed between the initial and resumed handshakes. This can cause the TLS implementation to incorrectly validate certificates, allowing an attacker to bypass certificate validation and establish unauthorized connections. The flaw requires specific conditions to be exploitable, including runtime changes to CA settings and TLS session resumption. Red Hat has assigned a CVSS v3 score of 7.4 (high) reflecting the complexity and impact limited to confidentiality and integrity. The vulnerability does not affect system availability and does not have known exploits in the wild. Red Hat has released security updates and advisories for affected products, including OpenShift Container Platform 4.14.68 and related container images.
Potential Impact
An attacker who can manipulate TLS session resumption and CA settings could bypass certificate validation, potentially allowing unauthorized connections that should have been rejected. This leads to an authentication bypass affecting confidentiality and integrity of TLS communications. The impact is limited to the crypto/tls component and does not affect system availability. Exploitation requires a controlled setup and is not straightforward. There are no known exploits in the wild at this time.
Mitigation Recommendations
Red Hat has released official security updates addressing this vulnerability. Users of affected Red Hat products, including OpenShift Container Platform 4.14, should apply the updates provided in Red Hat Advisory RHSA-2026:28893 and related errata. Instructions for upgrading clusters and applying asynchronous errata updates are available in Red Hat documentation. No additional mitigations are specified or required beyond applying the official fixes.
Red Hat Security Advisory: osbuild-composer security update
Description
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/tls: Unexpected session resumption in crypto/tls (CVE-2025-68121) * net/url: Incorrect parsing of IPv6 host literals in net/url (CVE-2026-25679) 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
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability (CVE-2025-68121) exists in the crypto/tls component used by Red Hat products such as OpenShift Container Platform. It occurs during TLS session resumption when the certificate authority (CA) settings are changed between the initial and resumed handshakes. This can cause the TLS implementation to incorrectly validate certificates, allowing an attacker to bypass certificate validation and establish unauthorized connections. The flaw requires specific conditions to be exploitable, including runtime changes to CA settings and TLS session resumption. Red Hat has assigned a CVSS v3 score of 7.4 (high) reflecting the complexity and impact limited to confidentiality and integrity. The vulnerability does not affect system availability and does not have known exploits in the wild. Red Hat has released security updates and advisories for affected products, including OpenShift Container Platform 4.14.68 and related container images.
Potential Impact
An attacker who can manipulate TLS session resumption and CA settings could bypass certificate validation, potentially allowing unauthorized connections that should have been rejected. This leads to an authentication bypass affecting confidentiality and integrity of TLS communications. The impact is limited to the crypto/tls component and does not affect system availability. Exploitation requires a controlled setup and is not straightforward. There are no known exploits in the wild at this time.
Mitigation Recommendations
Red Hat has released official security updates addressing this vulnerability. Users of affected Red Hat products, including OpenShift Container Platform 4.14, should apply the updates provided in Red Hat Advisory RHSA-2026:28893 and related errata. Instructions for upgrading clusters and applying asynchronous errata updates are available in Red Hat documentation. No additional mitigations are specified or required beyond applying the official fixes.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:19475
- Cve Count
- 2
- Additional Cves
- ["CVE-2026-25679"]
- State
- PUBLISHED
Threat ID: 6a16097fe29bf47b5064bc62
Added to database: 05/26/2026, 20:58:39 UTC
Last enriched: 08/14/2026, 19:51:52 UTC
Last updated: 09/15/2026, 01:45:45 UTC
Views: 147
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