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: golang.org/x/crypto/ssh: Denial of Service via crafted public key with excessive parameters (CVE-2026-39829) * golang.org/x/crypto/ssh: golang.org/x/crypto/ssh: Denial of Service via resource leak from unsolicited SSH responses (CVE-2026-39830) * 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, which facilitates building OCI container images, was found to include several vulnerabilities in its use of the golang.org/x/crypto/ssh library. These vulnerabilities include denial of service conditions triggered by crafted SSH certificates (CVE-2026-39835), crafted public keys with excessive parameters (CVE-2026-39829), resource leaks from unsolicited SSH responses (CVE-2026-39830), and a security bypass in the SSH agent due to improper handling of key restrictions (CVE-2026-39832). Red Hat has released security updates for buildah in Red Hat Enterprise Linux 10 and its variants to remediate these issues.
Potential Impact
The vulnerabilities can lead to denial of service conditions affecting the buildah tool, potentially disrupting container image building processes. Additionally, a security bypass vulnerability could allow unauthorized actions due to improper key restriction handling in the SSH agent component. These issues impact the confidentiality, integrity, and availability of the buildah tool's operations involving SSH communications.
Mitigation Recommendations
Red Hat has released an official security update for buildah in Red Hat Enterprise Linux 10 and its Extended Update Support and Extended Life Cycle variants. Users should apply the update as detailed in the Red Hat advisory RHSA-2026:36199 to remediate these vulnerabilities. For update instructions, refer to https://access.redhat.com/articles/11258. No additional mitigation steps are indicated beyond applying the official 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: golang.org/x/crypto/ssh: Denial of Service via crafted public key with excessive parameters (CVE-2026-39829) * golang.org/x/crypto/ssh: golang.org/x/crypto/ssh: Denial of Service via resource leak from unsolicited SSH responses (CVE-2026-39830) * 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
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The buildah package, which facilitates building OCI container images, was found to include several vulnerabilities in its use of the golang.org/x/crypto/ssh library. These vulnerabilities include denial of service conditions triggered by crafted SSH certificates (CVE-2026-39835), crafted public keys with excessive parameters (CVE-2026-39829), resource leaks from unsolicited SSH responses (CVE-2026-39830), and a security bypass in the SSH agent due to improper handling of key restrictions (CVE-2026-39832). Red Hat has released security updates for buildah in Red Hat Enterprise Linux 10 and its variants to remediate these issues.
Potential Impact
The vulnerabilities can lead to denial of service conditions affecting the buildah tool, potentially disrupting container image building processes. Additionally, a security bypass vulnerability could allow unauthorized actions due to improper key restriction handling in the SSH agent component. These issues impact the confidentiality, integrity, and availability of the buildah tool's operations involving SSH communications.
Mitigation Recommendations
Red Hat has released an official security update for buildah in Red Hat Enterprise Linux 10 and its Extended Update Support and Extended Life Cycle variants. Users should apply the update as detailed in the Red Hat advisory RHSA-2026:36199 to remediate these vulnerabilities. For update instructions, refer to https://access.redhat.com/articles/11258. No additional mitigation steps are indicated beyond applying the official 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-2026:36199
- Cve Count
- 4
- Additional Cves
- ["CVE-2026-39830","CVE-2026-39832","CVE-2026-39835"]
- Cvss Version
- null
Threat ID: 6a4e4ebac9d9e3dbe32851b1
Added to database: 07/08/2026, 13:20:58 UTC
Last enriched: 07/08/2026, 13:22:50 UTC
Last updated: 07/08/2026, 22:28:25 UTC
Views: 2
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