RHSA-2026:36199
Vulnerability from csaf_redhat - Published: 2026-07-07 13:15 - Updated: 2026-07-10 16:26Summary
Red Hat Security Advisory: buildah security update
Severity
Important
Notes
Topic: An update for buildah is now available for Red Hat Enterprise Linux 10.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: 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.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in golang.org/x/crypto/ssh. The RSA and DSA public key parsers in the affected component did not enforce size limits on key parameters. This vulnerability allows an unauthenticated client to provide a crafted public key with an excessively large modulus or DSA parameter during public key authentication. Successful exploitation could lead to a denial of service (DoS) due to prolonged CPU consumption during signature verification.
7.5 (High)
Affected products
Fixed
21 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-10.2.Z:buildah-2:1.43.1-3.el10_2.aarch64 | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-2:1.43.1-3.el10_2.ppc64le | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-2:1.43.1-3.el10_2.s390x | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-2:1.43.1-3.el10_2.src | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-2:1.43.1-3.el10_2.x86_64 | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-debuginfo-2:1.43.1-3.el10_2.aarch64 | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-debuginfo-2:1.43.1-3.el10_2.ppc64le | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-debuginfo-2:1.43.1-3.el10_2.s390x | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-debuginfo-2:1.43.1-3.el10_2.x86_64 | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-debugsource-2:1.43.1-3.el10_2.aarch64 | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-debugsource-2:1.43.1-3.el10_2.ppc64le | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-debugsource-2:1.43.1-3.el10_2.s390x | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-debugsource-2:1.43.1-3.el10_2.x86_64 | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-tests-2:1.43.1-3.el10_2.aarch64 | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-tests-2:1.43.1-3.el10_2.ppc64le | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-tests-2:1.43.1-3.el10_2.s390x | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-tests-2:1.43.1-3.el10_2.x86_64 | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-tests-debuginfo-2:1.43.1-3.el10_2.aarch64 | — |
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fix
Workaround
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| Unresolved product id: AppStream-10.2.Z:buildah-tests-debuginfo-2:1.43.1-3.el10_2.ppc64le | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-10.2.Z:buildah-tests-debuginfo-2:1.43.1-3.el10_2.s390x | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-tests-debuginfo-2:1.43.1-3.el10_2.x86_64 | — |
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Threats
Impact
Important
A flaw was found in golang.org/x/crypto/ssh. A remote malicious SSH peer can exploit this by sending unsolicited global request responses, which fills an internal buffer and blocks the connection's read loop. This prevents the associated resources from being released, leading to a resource leak per connection. The consequence is a Denial of Service (DoS) for the affected system.
7.5 (High)
Affected products
Fixed
21 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-10.2.Z:buildah-2:1.43.1-3.el10_2.aarch64 | — |
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fix
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| Unresolved product id: AppStream-10.2.Z:buildah-2:1.43.1-3.el10_2.ppc64le | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-2:1.43.1-3.el10_2.s390x | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-2:1.43.1-3.el10_2.src | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-2:1.43.1-3.el10_2.x86_64 | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-debuginfo-2:1.43.1-3.el10_2.aarch64 | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-debuginfo-2:1.43.1-3.el10_2.ppc64le | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-debuginfo-2:1.43.1-3.el10_2.s390x | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-debuginfo-2:1.43.1-3.el10_2.x86_64 | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-debugsource-2:1.43.1-3.el10_2.aarch64 | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-debugsource-2:1.43.1-3.el10_2.ppc64le | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-debugsource-2:1.43.1-3.el10_2.s390x | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-debugsource-2:1.43.1-3.el10_2.x86_64 | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-tests-2:1.43.1-3.el10_2.aarch64 | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-tests-2:1.43.1-3.el10_2.ppc64le | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-tests-2:1.43.1-3.el10_2.s390x | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-tests-2:1.43.1-3.el10_2.x86_64 | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-tests-debuginfo-2:1.43.1-3.el10_2.aarch64 | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-tests-debuginfo-2:1.43.1-3.el10_2.ppc64le | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-tests-debuginfo-2:1.43.1-3.el10_2.s390x | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-tests-debuginfo-2:1.43.1-3.el10_2.x86_64 | — |
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Threats
Impact
Important
A flaw was found in golang.org/x/crypto/ssh/agent. When a key was added to a remote agent, security restrictions, known as constraint extensions, were not properly processed during the request. This allowed these restrictions to be silently removed when keys were forwarded, leading to the unrestricted use of the key on the remote host. This vulnerability could enable an attacker to bypass intended security controls and perform unauthorized actions.
8.7 (High)
Affected products
Fixed
21 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-10.2.Z:buildah-2:1.43.1-3.el10_2.aarch64 | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-2:1.43.1-3.el10_2.ppc64le | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-2:1.43.1-3.el10_2.s390x | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-2:1.43.1-3.el10_2.src | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-2:1.43.1-3.el10_2.x86_64 | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-debuginfo-2:1.43.1-3.el10_2.aarch64 | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-debuginfo-2:1.43.1-3.el10_2.ppc64le | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-debuginfo-2:1.43.1-3.el10_2.s390x | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-debuginfo-2:1.43.1-3.el10_2.x86_64 | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-debugsource-2:1.43.1-3.el10_2.aarch64 | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-debugsource-2:1.43.1-3.el10_2.ppc64le | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-debugsource-2:1.43.1-3.el10_2.s390x | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-debugsource-2:1.43.1-3.el10_2.x86_64 | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-tests-2:1.43.1-3.el10_2.aarch64 | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-tests-2:1.43.1-3.el10_2.ppc64le | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-tests-2:1.43.1-3.el10_2.s390x | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-tests-2:1.43.1-3.el10_2.x86_64 | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-tests-debuginfo-2:1.43.1-3.el10_2.aarch64 | — |
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fix
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| Unresolved product id: AppStream-10.2.Z:buildah-tests-debuginfo-2:1.43.1-3.el10_2.ppc64le | — |
Vendor Fix
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Workaround
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| Unresolved product id: AppStream-10.2.Z:buildah-tests-debuginfo-2:1.43.1-3.el10_2.s390x | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-tests-debuginfo-2:1.43.1-3.el10_2.x86_64 | — |
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Workaround
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Threats
Impact
Important
A flaw was found in golang.org/x/crypto/ssh. SSH servers configured to use CertChecker as a public key callback, without explicitly setting IsUserAuthority or IsHostAuthority, are vulnerable. A remote attacker can exploit this by presenting a specially crafted certificate, causing the server to panic and resulting in a Denial of Service (DoS).
7.5 (High)
Affected products
Fixed
21 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-10.2.Z:buildah-2:1.43.1-3.el10_2.aarch64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-10.2.Z:buildah-2:1.43.1-3.el10_2.ppc64le | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-10.2.Z:buildah-2:1.43.1-3.el10_2.s390x | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-10.2.Z:buildah-2:1.43.1-3.el10_2.src | — |
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Workaround
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| Unresolved product id: AppStream-10.2.Z:buildah-2:1.43.1-3.el10_2.x86_64 | — |
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Workaround
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| Unresolved product id: AppStream-10.2.Z:buildah-debuginfo-2:1.43.1-3.el10_2.aarch64 | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-debuginfo-2:1.43.1-3.el10_2.ppc64le | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-debuginfo-2:1.43.1-3.el10_2.s390x | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-debuginfo-2:1.43.1-3.el10_2.x86_64 | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-debugsource-2:1.43.1-3.el10_2.aarch64 | — |
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Workaround
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| Unresolved product id: AppStream-10.2.Z:buildah-debugsource-2:1.43.1-3.el10_2.ppc64le | — |
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Workaround
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| Unresolved product id: AppStream-10.2.Z:buildah-debugsource-2:1.43.1-3.el10_2.s390x | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-debugsource-2:1.43.1-3.el10_2.x86_64 | — |
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Workaround
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| Unresolved product id: AppStream-10.2.Z:buildah-tests-2:1.43.1-3.el10_2.aarch64 | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-tests-2:1.43.1-3.el10_2.ppc64le | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-tests-2:1.43.1-3.el10_2.s390x | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-tests-2:1.43.1-3.el10_2.x86_64 | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-tests-debuginfo-2:1.43.1-3.el10_2.aarch64 | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-tests-debuginfo-2:1.43.1-3.el10_2.ppc64le | — |
Vendor Fix
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Workaround
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| Unresolved product id: AppStream-10.2.Z:buildah-tests-debuginfo-2:1.43.1-3.el10_2.s390x | — |
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| Unresolved product id: AppStream-10.2.Z:buildah-tests-debuginfo-2:1.43.1-3.el10_2.x86_64 | — |
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Threats
Impact
Important
References
38 references
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"text": "This vulnerability in golang.org/x/crypto/ssh is rated as Important. An unauthenticated remote attacker could trigger a denial of service by providing a specially crafted public key with excessively large parameters during SSH public key authentication. This could lead to prolonged CPU consumption on the server, impacting service availability.",
"title": "Statement"
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"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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"title": "Vulnerability description"
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"title": "Vulnerability summary"
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{
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"title": "Statement"
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{
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"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
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}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "golang.org/x/crypto/ssh: golang: golang.org/x/crypto/ssh: Denial of Service via crafted SSH certificate"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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