RHSA-2026:69917
Vulnerability from csaf_redhat - Published: 2026-09-22 08:24 - Updated: 2026-09-22 16:58A flaw was found in BuildKit. A custom client with valid permissions to access the BuildKit control API can produce an upload request that allows files to escape from the BuildKit-controlled state directory. This could lead to unauthorized modification or disclosure of sensitive data.
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: OpenShift Developer Tools and Services 1.6.4:registry.redhat.io/source-to-image/source-to-image-rhel8@sha256:1a13a18c6ce149cb7f35d92b3b9ec387d7f5520e64732640e7b6623ae9b08c76_amd64 | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.4:registry.redhat.io/source-to-image/source-to-image-rhel8@sha256:9415b7a37f636864f6a8c270889af97f983338cd7fcbf494382032bfff51baa9_ppc64le | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.4:registry.redhat.io/source-to-image/source-to-image-rhel8@sha256:d805bea3d5bbaa3950e60d71c85949f99ca1a9536181138c08d994d995fbd554_s390x | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.4:registry.redhat.io/source-to-image/source-to-image-rhel8@sha256:f7ba08425fda74d94390e3dda2fc8135c15eb1a6f4fdeb666f46d7ecb5480cfd_arm64 | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.4:registry.redhat.io/source-to-image/source-to-image-rhel9@sha256:2ede56781677401ebdfe455a0e36f6a69eadc913adcdc90fddd4b137a420b820_amd64 | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.4:registry.redhat.io/source-to-image/source-to-image-rhel9@sha256:8ced59d7063806177cbbb79eec99a10a5a9a3501103ffe819c90a6f4c4d0a6bb_arm64 | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.4:registry.redhat.io/source-to-image/source-to-image-rhel9@sha256:acca1d1e326b4f13608d6f8497e984b2d6ff70b169858b84f33848e0b79dab2a_s390x | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.4:registry.redhat.io/source-to-image/source-to-image-rhel9@sha256:e7019e87be4a040e668e361641a360be23fabe963070b123689c446499c1731f_ppc64le | — |
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A flaw was found in the `encoding/asn1` package in Go. An attacker could provide a specially crafted, deeply-nested Abstract Syntax Notation One (ASN.1) structure, leading to excessive recursion during the `Unmarshal` operation. This could result in stack exhaustion and a Denial of Service (DoS) condition.
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: OpenShift Developer Tools and Services 1.6.4:registry.redhat.io/source-to-image/source-to-image-rhel8@sha256:1a13a18c6ce149cb7f35d92b3b9ec387d7f5520e64732640e7b6623ae9b08c76_amd64 | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.4:registry.redhat.io/source-to-image/source-to-image-rhel8@sha256:9415b7a37f636864f6a8c270889af97f983338cd7fcbf494382032bfff51baa9_ppc64le | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.4:registry.redhat.io/source-to-image/source-to-image-rhel8@sha256:d805bea3d5bbaa3950e60d71c85949f99ca1a9536181138c08d994d995fbd554_s390x | — |
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| Unresolved product id: OpenShift Developer Tools and Services 1.6.4:registry.redhat.io/source-to-image/source-to-image-rhel8@sha256:f7ba08425fda74d94390e3dda2fc8135c15eb1a6f4fdeb666f46d7ecb5480cfd_arm64 | — |
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| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: OpenShift Developer Tools and Services 1.6.4:registry.redhat.io/source-to-image/source-to-image-rhel9@sha256:2ede56781677401ebdfe455a0e36f6a69eadc913adcdc90fddd4b137a420b820_amd64 | — | ||
| Unresolved product id: OpenShift Developer Tools and Services 1.6.4:registry.redhat.io/source-to-image/source-to-image-rhel9@sha256:8ced59d7063806177cbbb79eec99a10a5a9a3501103ffe819c90a6f4c4d0a6bb_arm64 | — | ||
| Unresolved product id: OpenShift Developer Tools and Services 1.6.4:registry.redhat.io/source-to-image/source-to-image-rhel9@sha256:acca1d1e326b4f13608d6f8497e984b2d6ff70b169858b84f33848e0b79dab2a_s390x | — | ||
| Unresolved product id: OpenShift Developer Tools and Services 1.6.4:registry.redhat.io/source-to-image/source-to-image-rhel9@sha256:e7019e87be4a040e668e361641a360be23fabe963070b123689c446499c1731f_ppc64le | — |
A flaw was found in OpenTelemetry-Go. This vulnerability allows a remote attacker to cause a Denial of Service (DoS) by sending oversized or invalid baggage headers. The `Parse` function, in affected versions, failed to reject raw-length inputs, leading to excessive processing and error logging when handling these large inputs.
A flaw was found in the `net/http` component of the Go standard library. When a server is configured to support unencrypted HTTP/2, it reads initial bytes from new connections to detect the HTTP/2 client preface. However, the `ReadHeaderTimeout` is not correctly applied during this process. This oversight could allow a remote attacker to maintain open connections indefinitely, potentially leading to a Denial of Service (DoS) by exhausting server resources.
A flaw was found in `net/url`, a component of `golang`. This vulnerability arises when resolving relative paths that contain numerous parent directory ('..') segments. A remote attacker could exploit this by providing a specially crafted path, leading to quadratic time complexity and excessive memory allocation. This can result in a Denial of Service (DoS) due to resource exhaustion.
A flaw was found in the `crypto/tls` package, part of `golang`. A malicious client can exploit this vulnerability by continuously sending KeyUpdate messages to a server. This forces the server to perform indefinite key derivation operations, leading to resource exhaustion and a Denial of Service (DoS) condition.
A flaw was found in BuildKit, a toolkit for converting source code to build artifacts. A malicious client with valid permissions to access the BuildKit control API can craft a special upload request. This request allows files to escape from the BuildKit-controlled state directory, potentially leading to unauthorized modification or deletion of files on the system.
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"url": "https://access.redhat.com/errata/RHSA-2026:69917"
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"details": "Restrict access to the BuildKit control API to only trusted users and services. Implement robust authentication and authorization policies for all clients interacting with the BuildKit daemon to prevent unauthorized access and potential file system escapes.",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
"version": "3.1"
},
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"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "github.com/moby/buildkit: BuildKit: File escape vulnerability allows unauthorized file modification"
}
]
}
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.
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.
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.