Red Hat Security Advisory: buildah security update
The buildah package provides a tool for facilitating building OCI container images. Among other things, buildah enables you to: Create a working container, either from scratch or using an image as a starting point; Create an image, either from a working container or using the instructions in a Dockerfile; Build both Docker and OCI images. Security Fix(es): * golang.org/x/crypto/ssh: golang: golang.org/x/crypto/ssh: Denial of Service via crafted SSH certificate (CVE-2026-39835) * golang.org/x/crypto/ssh/agent: golang.org/x/crypto/ssh/agent: Security bypass due to improper handling of key restrictions (CVE-2026-39832) 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 buildah package for Red Hat Enterprise Linux 9 has two security vulnerabilities related to the golang.org/x/crypto/ssh libraries. CVE-2026-39835 is a denial of service vulnerability triggered by a crafted SSH certificate. CVE-2026-39832 is a security bypass caused by improper handling of key restrictions in the SSH agent. Red Hat has released updated buildah packages that fix these issues. The advisory covers multiple architectures including x86_64, s390x, ppc64le, and aarch64. The update is rated as Important by Red Hat Product Security. No CVSS scores are provided in the advisory, but the severity is assessed as high.
Potential Impact
Successful exploitation of CVE-2026-39835 could allow denial of service via a crafted SSH certificate, potentially disrupting services that use buildah with SSH. CVE-2026-39832 could allow an attacker to bypass security restrictions related to SSH key handling, potentially leading to unauthorized actions within the buildah environment. The advisory does not report known exploits in the wild. The vulnerabilities affect the security posture of container image building processes that rely on the affected SSH libraries.
Mitigation Recommendations
Red Hat has released updated buildah packages that address these vulnerabilities. Users should apply the security update for buildah on Red Hat Enterprise Linux 9 as described in the Red Hat advisory (https://access.redhat.com/articles/11258). The update includes fixes for both CVE-2026-39835 and CVE-2026-39832. No additional mitigation steps are indicated beyond applying the official update.
Red Hat Security Advisory: buildah security update
Description
The buildah package provides a tool for facilitating building OCI container images. Among other things, buildah enables you to: Create a working container, either from scratch or using an image as a starting point; Create an image, either from a working container or using the instructions in a Dockerfile; Build both Docker and OCI images. Security Fix(es): * golang.org/x/crypto/ssh: golang: golang.org/x/crypto/ssh: Denial of Service via crafted SSH certificate (CVE-2026-39835) * golang.org/x/crypto/ssh/agent: golang.org/x/crypto/ssh/agent: Security bypass due to improper handling of key restrictions (CVE-2026-39832) 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.
CVSS v3.1
Affected software
pkg:golang/golang.org/x/crypto/ssh/agentRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The buildah package for Red Hat Enterprise Linux 9 has two security vulnerabilities related to the golang.org/x/crypto/ssh libraries. CVE-2026-39835 is a denial of service vulnerability triggered by a crafted SSH certificate. CVE-2026-39832 is a security bypass caused by improper handling of key restrictions in the SSH agent. Red Hat has released updated buildah packages that fix these issues. The advisory covers multiple architectures including x86_64, s390x, ppc64le, and aarch64. The update is rated as Important by Red Hat Product Security. No CVSS scores are provided in the advisory, but the severity is assessed as high.
Potential Impact
Successful exploitation of CVE-2026-39835 could allow denial of service via a crafted SSH certificate, potentially disrupting services that use buildah with SSH. CVE-2026-39832 could allow an attacker to bypass security restrictions related to SSH key handling, potentially leading to unauthorized actions within the buildah environment. The advisory does not report known exploits in the wild. The vulnerabilities affect the security posture of container image building processes that rely on the affected SSH libraries.
Mitigation Recommendations
Red Hat has released updated buildah packages that address these vulnerabilities. Users should apply the security update for buildah on Red Hat Enterprise Linux 9 as described in the Red Hat advisory (https://access.redhat.com/articles/11258). The update includes fixes for both CVE-2026-39835 and CVE-2026-39832. No additional mitigation steps are indicated beyond applying the official 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-2026:37410
- Cve Count
- 2
- Additional Cves
- ["CVE-2026-39835"]
- Cvss Version
- null
Threat ID: 6a50ba4168715ace4357e317
Added to database: 07/10/2026, 09:24:17 UTC
Last enriched: 07/10/2026, 09:35:17 UTC
Last updated: 07/12/2026, 19:47:35 UTC
Views: 10
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