BuildKit: Malicious client can bypass destination directory validation on local sources upload
Priority MEDIUM 40CWE-22Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- —
- Confidentiality · integrity · availability
- None · High · High
- Fix status
- Partial Red Hat: 6 fixed, 28 without a fix
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat.
Summary
BuildKit is a toolkit for converting source code to build artifacts in an efficient, expressive and repeatable manner. Prior to 0.31.2, a custom client can produce such an upload request to the BuildKit daemon that files can escape from the BuildKit-controlled state directory. The client needs to have valid permissions to access BuildKit control API to issue builds, eg., bypass authentication, etc. This issue is fixed in version 0.31.2.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00541 45th percentileScored 2026-11-07
Fix Partial buildkit (moby): 0.31.2Red Hat: 8 advisoriesRed Hat: 6 fixed, 28 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| moby | buildkit | before 0.31.2 | 0.31.2 | Patch available | CNA |
- buildkit Vendormoby Affected before 0.31.2 Fixed in 0.31.2 Patch available CNA
CPE names Threatist (inferred) · 1
Inferred from how NVD named this product before; not given by a source.
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mobyproject:buildkit:*:*:*:*:*:*:*:* | — | — | Mobyproject |
- cpe:2.3:a:mobyproject:buildkit:*:*:*:*:*:*:*:* Versions — — ·Mobyproject
Remediation
- Fix · CNA buildkit (moby) Fixed in 0.31.2
Red Hat 8 advisories
- RHSA-2026:84734 Released 2026-10-19 · Red Hat rating CriticalRHOAI 3.4.5 - Red Hat OpenShift AI
- Red Hat OpenShift AI 3.4 registry.redhat.io/rhoai/odh-ai-gateway-payload-processing-rhel9, registry.redhat.io/rhoai/odh-automl-rhel9, registry.redhat.io/rhoai/odh-autorag-rhel9 +47
- RHSA-2026:69917 Released 2026-09-22 · Red Hat rating ImportantOpenShift Source To Image 1.6.4
- OpenShift Developer Tools and Services 1.6.4 registry.redhat.io/source-to-image/source-to-image-rhel8, registry.redhat.io/source-to-image/source-to-image-rhel9
- RHSA-2026:69255 Released 2026-09-21 · Red Hat rating ImportantRed Hat Quay 3.16.6
- Red Hat Quay 3.16 registry.redhat.io/quay/quay-rhel9
Show 5 more Red Hat advisories
- RHSA-2026:66521 Released 2026-09-10 · Red Hat rating ImportantLogging for Red Hat OpenShift - 6.6.1
- Logging Subsystem for Red Hat OpenShift 6.6 registry.redhat.io/openshift-logging/cluster-logging-rhel9-operator, registry.redhat.io/openshift-logging/eventrouter-rhel9, registry.redhat.io/openshift-logging/lokistack-gateway-rhel9 +1
- RHSA-2026:66022 Released 2026-09-09 · Red Hat rating ImportantRed Hat OpenShift API for Data Protection
- OpenShift API for Data Protection 1.5 registry.redhat.io/oadp/oadp-kubevirt-velero-plugin-rhel9, registry.redhat.io/oadp/oadp-mustgather-rhel9, registry.redhat.io/oadp/oadp-rhel9-operator +4
- RHSA-2026:52807 Released 2026-08-10 · Red Hat rating ImportantRed Hat Hardened Images RPMs bug fix and enhancement update
- Red Hat Hardened Images podman-5:6.0.2-2.2.hum1@aarch64, podman-5:6.0.2-2.2.hum1@src, podman-5:6.0.2-2.2.hum1@x86_64 +8
- RHSA-2026:51065 Released 2026-08-06 · Red Hat rating ImportantRed Hat Hardened Images RPMs Security Update
- Red Hat Hardened Images buildah-2:1.45.0-2.hum1@aarch64, buildah-2:1.45.0-2.hum1@src, buildah-2:1.45.0-2.hum1@x86_64
- RHSA-2026:50953 Released 2026-08-06 · Red Hat rating ImportantRed Hat Hardened Images RPMs bug fix and enhancement update
- Red Hat Hardened Images trivy-0.73.0-0.1.hum1@aarch64, trivy-0.73.0-0.1.hum1@src, trivy-0.73.0-0.1.hum1@x86_64
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Assisted Installer for Red Hat OpenShift Container Platform 2 | Affected | No fix yet |
| Compliance Operator | Affected | No fix yet |
| Kernel Module Management Operator for Red Hat Openshift | Affected | No fix yet |
| Migration Toolkit for Containers | Affected | No fix yet |
| Migration Toolkit for Virtualization | Affected | No fix yet |
| Multicluster Engine for Kubernetes | Affected | No fix yet |
| Node HealthCheck Operator | Affected | No fix yet |
| OpenShift Developer Tools and Services | Affected | No fix yet |
| OpenShift Lightspeed | Affected | No fix planned: Will not fix |
| OpenShift Serverless | Affected | No fix yet |
| OpenShift Service Mesh 3 | Affected | No fix yet |
| Power monitoring for Red Hat OpenShift | Affected | No fix yet |
| Red Hat Ansible Automation Platform 2 | Affected | No fix yet |
| Red Hat Build of Podman Desktop | Affected | No fix yet |
| Red Hat Ceph Storage 9 | Affected | No fix yet |
| Red Hat Certification Program for Red Hat Enterprise Linux 9 | Affected | No fix yet |
| Red Hat Developer Hub 1 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux 10 | Affected | No fix yet |
| Red Hat Enterprise Linux 9 | Affected | No fix yet |
| Red Hat OpenShift AI (RHOAI) | Affected | No fix yet |
| Red Hat OpenShift Container Platform 4 | Affected | No fix yet |
| Red Hat OpenShift Container Platform 5 | Affected | No fix yet |
| Red Hat OpenShift GitOps | Affected | No fix yet: Fix deferred |
| Red Hat OpenStack Platform 18.0 | Affected | No fix yet |
| Red Hat Openshift Data Foundation 4 | Affected | No fix yet |
| Red Hat Quay 3 | Affected | No fix yet |
| Red Hat Trusted Artifact Signer | Affected | No fix yet |
| Red Hat Web Terminal | Affected | No fix yet |
| Logging Subsystem for Red Hat OpenShift 6.6 | Fixed | RHSA-2026:66521 |
| OpenShift API for Data Protection 1.5 | Fixed | RHSA-2026:66022 |
| OpenShift Developer Tools and Services 1.6.4 | Fixed | RHSA-2026:69917 |
| Red Hat Hardened Images | Fixed | RHSA-2026:50953, RHSA-2026:51065, RHSA-2026:52807 |
| Red Hat OpenShift AI 3.4 | Fixed | RHSA-2026:84734 |
| Red Hat Quay 3.16 | Fixed | RHSA-2026:69255 |
Not affected: 23 products
- Assisted Installer for Red Hat OpenShift Container Platform 2
- Confidential Compute Attestation
- Logging Subsystem for Red Hat OpenShift 6.6
- Logical Volume Manager Storage
- Migration Toolkit for Applications 8
- Multicluster Engine for Kubernetes
- OpenShift API for Data Protection 1.5
- OpenShift Service Mesh 3
- Pen Drive Powered by Red Hat Lightspeed
- Red Hat Advanced Cluster Management for Kubernetes 2
- Red Hat Ansible Automation Platform 2
- Red Hat Build of Kueue
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift AI (RHOAI)
- Red Hat OpenShift AI 3.4
- Red Hat OpenShift Container Platform 4
- Red Hat OpenShift Container Platform 5
- Red Hat OpenShift Dev Spaces
- Red Hat OpenShift Virtualization 4
- Red Hat Openshift Data Foundation 4
- Red Hat Quay 3.16
Timeline
- 2026-10-02 Threatist record created from CVE-2026-75593
- 2026-10-03 Alias added: GHSA-wqjv-cjqw-p7p5
- 2026-10-13 Affected versions changed · Red Hat
- 2026-10-20 Fix available: RHSA-2026:84734 · Red Hat
- 2026-10-20 Fix available: Red Hat OpenShift AI 3.4 · Red Hat
- 2026-10-27 Affected versions changed · Red Hat
- 2026-10-30 Affected versions changed · Red Hat
References
More moby vulnerabilities
- TI-2026-14229 Tar extraction in moby/go-archive can write outside the destination directory via link following CVSS 4.0HIGH 7.1
- TI-2021-12512 Moby HyperKit uninitialized memory use in virtio-sock pci_vtsock_proc_tx CVSS 3.1HIGH 7.1
- TI-2024-27462 Moby authz zero length regression CVSS 3.1CRITICAL 10.0
- TI-2024-15672 BuildKit interactive containers API does not validate entitlements check CVSS 3.1CRITICAL 9.8
- TI-2024-15671 BuildKit possible host system access from mount stub cleaner CVSS 3.1CRITICAL 10.0
- TI-2026-26365 Moby: AuthZ plugin bypass with oversized request body CVSS 3.1HIGH 8.8
Sources
- CVE-2026-75593 · CVE Program
- CVE-2026-75593 · NVD
- FIRST EPSS
- GHSA-wqjv-cjqw-p7p5 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-75593 · Red Hat security data · CC BY 4.0
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