RHSA-2026:43122
Vulnerability from csaf_redhat - Published: 2026-07-22 01:01 - Updated: 2026-09-21 11:01Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
Severity
Moderate
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs:
buildah:
* buildah-1.44.0-3.2.hum1 (aarch64, x86_64)
* buildah-tests-1.44.0-3.2.hum1 (aarch64, x86_64)
* buildah-1.44.0-3.2.hum1.src (src)
Security Fix(es):
buildah:
* CVE-2026-15788
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 BuildKit. An untrusted user, when authoring a build on a Windows Container on Windows (WCOW) configured BuildKit daemon, can exploit a vulnerability in the cache mount source selector. This flaw allows the user to read arbitrary files from the host system, leading to information disclosure.
6.3 (Medium)
Affected products
Fixed
3 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:buildah-0:1.44.0-3.2.hum1@aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: Red Hat Hardened Images:buildah-0:1.44.0-3.2.hum1@src | — |
Vendor Fix
fix
|
|
| Unresolved product id: Red Hat Hardened Images:buildah-0:1.44.0-3.2.hum1@x86_64 | — |
Vendor Fix
fix
|
Threats
Impact
Moderate
A flaw was found in BuildKit. A malicious BuildKit client or frontend can craft a specially designed request, leading to the BuildKit daemon crashing. This vulnerability results in a denial of service (DoS), making the BuildKit service unavailable.
6.5 (Medium)
Affected products
Fixed
3 products, the same list as for
CVE-2026-15788
Threats
Impact
Moderate
References
16 references
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"text": "This update includes the following RPMs:\n\nbuildah:\n * buildah-1.44.0-3.2.hum1 (aarch64, x86_64)\n * buildah-tests-1.44.0-3.2.hum1 (aarch64, x86_64)\n * buildah-1.44.0-3.2.hum1.src (src)\n\nSecurity Fix(es):\n\nbuildah:\n * CVE-2026-15788",
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"cve": "CVE-2026-15788",
"cwe": {
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"name": "Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)"
},
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"ids": [
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"notes": [
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"category": "description",
"text": "A flaw was found in BuildKit. An untrusted user, when authoring a build on a Windows Container on Windows (WCOW) configured BuildKit daemon, can exploit a vulnerability in the cache mount source selector. This flaw allows the user to read arbitrary files from the host system, leading to information disclosure.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "github.com/moby/buildkit: BuildKit: Information Disclosure via Improper Handling of NTFS Directory Junctions",
"title": "Vulnerability summary"
},
{
"category": "general",
"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.",
"title": "CVSS score applicability"
}
],
"product_status": {
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"Red Hat Hardened Images:buildah-0:1.44.0-3.2.hum1@aarch64",
"Red Hat Hardened Images:buildah-0:1.44.0-3.2.hum1@src",
"Red Hat Hardened Images:buildah-0:1.44.0-3.2.hum1@x86_64"
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"url": "https://www.cve.org/CVERecord?id=CVE-2026-15788"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-15788",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-15788"
},
{
"category": "external",
"summary": "https://github.com/moby/buildkit/security/advisories/GHSA-388v-wmr2-g2v2",
"url": "https://github.com/moby/buildkit/security/advisories/GHSA-388v-wmr2-g2v2"
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"date": "2026-07-22T01:01:59+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
"product_ids": [
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"Red Hat Hardened Images:buildah-0:1.44.0-3.2.hum1@src",
"Red Hat Hardened Images:buildah-0:1.44.0-3.2.hum1@x86_64"
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"scores": [
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"attackVector": "LOCAL",
"availabilityImpact": "NONE",
"baseScore": 6.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N",
"version": "3.1"
},
"products": [
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"Red Hat Hardened Images:buildah-0:1.44.0-3.2.hum1@src",
"Red Hat Hardened Images:buildah-0:1.44.0-3.2.hum1@x86_64"
]
}
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"threats": [
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"details": "Moderate"
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"title": "github.com/moby/buildkit: BuildKit: Information Disclosure via Improper Handling of NTFS Directory Junctions"
},
{
"cve": "CVE-2026-15792",
"cwe": {
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"discovery_date": "2026-07-21T17:01:51.555730+00:00",
"ids": [
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"notes": [
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"category": "description",
"text": "A flaw was found in BuildKit. A malicious BuildKit client or frontend can craft a specially designed request, leading to the BuildKit daemon crashing. This vulnerability results in a denial of service (DoS), making the BuildKit service unavailable.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "github.com/moby/buildkit: BuildKit: Denial of Service via malicious client request",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "BuildKit is used by several Red Hat products to build container images. This issue allows a malicious BuildKit frontend or client to cause the BuildKit build process to crash. Exploiting this issue requires the ability to supply a build definition (for example, a Dockerfile specifying a custom #syntax frontend) to a BuildKit-based build; it does not allow remote code execution or exposure of data. The issue is fixed upstream in BuildKit version 0.31.2. Red Hat Hardened Images (Buildah, Podman, and Trivy) has already shipped the fixed version. Other affected Red Hat products are being assessed and will ship the fixed version of BuildKit in upcoming releases.",
"title": "Statement"
},
{
"category": "general",
"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.",
"title": "CVSS score applicability"
}
],
"product_status": {
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"Red Hat Hardened Images:buildah-0:1.44.0-3.2.hum1@aarch64",
"Red Hat Hardened Images:buildah-0:1.44.0-3.2.hum1@src",
"Red Hat Hardened Images:buildah-0:1.44.0-3.2.hum1@x86_64"
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"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2503746"
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"url": "https://www.cve.org/CVERecord?id=CVE-2026-15792"
},
{
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-15792"
},
{
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"url": "https://github.com/moby/buildkit/security/advisories/GHSA-qx3x-mv6r-52p6"
}
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"Red Hat Hardened Images:buildah-0:1.44.0-3.2.hum1@src",
"Red Hat Hardened Images:buildah-0:1.44.0-3.2.hum1@x86_64"
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"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:43122"
},
{
"category": "workaround",
"details": "Avoid building container images using BuildKit frontends from untrusted sources. A BuildKit frontend is typically specified using a \"# syntax\" directive at the top of a Dockerfile, or with the \"--frontend\" option to the \"buildctl build\" command. Only use frontend images that come from a trusted source.",
"product_ids": [
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"Red Hat Hardened Images:buildah-0:1.44.0-3.2.hum1@src",
"Red Hat Hardened Images:buildah-0:1.44.0-3.2.hum1@x86_64"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"products": [
"Red Hat Hardened Images:buildah-0:1.44.0-3.2.hum1@aarch64",
"Red Hat Hardened Images:buildah-0:1.44.0-3.2.hum1@src",
"Red Hat Hardened Images:buildah-0:1.44.0-3.2.hum1@x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "github.com/moby/buildkit: BuildKit: Denial of Service via malicious client request"
}
]
}
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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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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