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 in Red Hat Enterprise Linux 10 includes dependencies on golang.org/x/crypto/ssh which contain multiple security vulnerabilities: CVE-2026-39829 (denial of service via crafted public key with excessive parameters), CVE-2026-39830 (denial of service via resource leak from unsolicited SSH responses), CVE-2026-39832 (security bypass due to improper handling of key restrictions in ssh/agent), and CVE-2026-39835 (denial of service via crafted SSH certificate). These vulnerabilities could allow denial of service or security bypass conditions when processing specially crafted SSH data. Red Hat has released updated buildah packages to remediate these issues.
Potential Impact
The vulnerabilities can cause denial of service conditions or security bypass in the SSH components used by buildah, potentially disrupting container image building processes or allowing unauthorized actions due to improper key restriction handling. The impact is rated as important by Red Hat, indicating significant security concerns but not necessarily remote code execution or data disclosure.
Mitigation Recommendations
Red Hat has released updated buildah packages (version 1.43.1-3.el10_2) for Red Hat Enterprise Linux 10 and related variants that address these vulnerabilities. Users should apply these official updates promptly to remediate the issues. For detailed update instructions, refer to the Red Hat advisory at https://access.redhat.com/articles/11258. No alternative mitigations or workarounds are indicated in the advisory.
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.
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The buildah package in Red Hat Enterprise Linux 10 includes dependencies on golang.org/x/crypto/ssh which contain multiple security vulnerabilities: CVE-2026-39829 (denial of service via crafted public key with excessive parameters), CVE-2026-39830 (denial of service via resource leak from unsolicited SSH responses), CVE-2026-39832 (security bypass due to improper handling of key restrictions in ssh/agent), and CVE-2026-39835 (denial of service via crafted SSH certificate). These vulnerabilities could allow denial of service or security bypass conditions when processing specially crafted SSH data. Red Hat has released updated buildah packages to remediate these issues.
Potential Impact
The vulnerabilities can cause denial of service conditions or security bypass in the SSH components used by buildah, potentially disrupting container image building processes or allowing unauthorized actions due to improper key restriction handling. The impact is rated as important by Red Hat, indicating significant security concerns but not necessarily remote code execution or data disclosure.
Mitigation Recommendations
Red Hat has released updated buildah packages (version 1.43.1-3.el10_2) for Red Hat Enterprise Linux 10 and related variants that address these vulnerabilities. Users should apply these official updates promptly to remediate the issues. For detailed update instructions, refer to the Red Hat advisory at https://access.redhat.com/articles/11258. No alternative mitigations or workarounds are indicated in the advisory.
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
- 3.1
Threat ID: 6a4e4ebac9d9e3dbe32851b1
Added to database: 07/08/2026, 13:20:58 UTC
Last enriched: 08/14/2026, 18:59:48 UTC
Last updated: 08/22/2026, 22:52:13 UTC
Views: 77
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.
External Links
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.