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, used for building OCI container images, includes dependencies on golang.org/x/crypto/ssh components that contain two security vulnerabilities. CVE-2026-39835 allows denial of service via a crafted SSH certificate, while CVE-2026-39832 permits a security bypass due to improper handling of key restrictions in the SSH agent. Red Hat has issued an advisory (RHSA-2026:37410) providing updated buildah packages for Red Hat Enterprise Linux 9 and its variants to address these vulnerabilities.
Potential Impact
These vulnerabilities could allow an attacker to cause denial of service or bypass security restrictions related to SSH key handling when using buildah. This may impact the security of container image building processes relying on these SSH components. The severity is rated as high by Red Hat Product Security.
Mitigation Recommendations
A security update for buildah is available from Red Hat and should be applied promptly. The advisory RHSA-2026:37410 provides updated packages for Red Hat Enterprise Linux 9 and related variants. Users should follow Red Hat's official guidance to apply the update. No additional mitigation steps are indicated beyond applying the patch.
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.
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, used for building OCI container images, includes dependencies on golang.org/x/crypto/ssh components that contain two security vulnerabilities. CVE-2026-39835 allows denial of service via a crafted SSH certificate, while CVE-2026-39832 permits a security bypass due to improper handling of key restrictions in the SSH agent. Red Hat has issued an advisory (RHSA-2026:37410) providing updated buildah packages for Red Hat Enterprise Linux 9 and its variants to address these vulnerabilities.
Potential Impact
These vulnerabilities could allow an attacker to cause denial of service or bypass security restrictions related to SSH key handling when using buildah. This may impact the security of container image building processes relying on these SSH components. The severity is rated as high by Red Hat Product Security.
Mitigation Recommendations
A security update for buildah is available from Red Hat and should be applied promptly. The advisory RHSA-2026:37410 provides updated packages for Red Hat Enterprise Linux 9 and related variants. Users should follow Red Hat's official guidance to apply the update. No additional mitigation steps are indicated beyond applying the patch.
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
- 3.1
Threat ID: 6a50ba4168715ace4357e317
Added to database: 07/10/2026, 09:24:17 UTC
Last enriched: 08/14/2026, 23:41:35 UTC
Last updated: 08/26/2026, 22:52:10 UTC
Views: 101
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.