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Fencer Intel
high 7.2

CVE-2026-75593 json

BuildKit: Malicious client can bypass destination directory validation on local sources upload

published 2mo ago modified 2mo ago also EUVD-2026-62839

cvss
7.2
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 45%
public exploits
0
none known

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.

Patch / fix

  • mobyproject buildkit 0.31.2
  • trivy hummingbird 1 0.73.0-0.1.hum1
  • podman hummingbird 1 6.0.2-2.2.hum1
  • podmansh hummingbird 1 6.0.2-2.2.hum1
  • podman-docker hummingbird 1 6.0.2-2.2.hum1
  • podman-remote hummingbird 1 6.0.2-2.2.hum1
  • podman-machine hummingbird 1 6.0.2-2.2.hum1
  • buildah hummingbird 1 1.45.0-2.hum1

red hat advisories RHSA-2026:50953RHSA-2026:52807RHSA-2026:51065

  • moby-engine Azure Linux 3.0 25.0.3-20

azure linux advisories AZL-97035

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-75593 updated cvss 6.5

github.com/moby/buildkit: BuildKit: File escape vulnerability allows unauthorized file modification

  • Red Hat Assisted Installer for Red Hat OpenShift Container Platform 2 rhai/assisted-installer-controller-rhel9 Red Hat Compliance Operator compliance/openshift-compliance-must-gather-rhel8 Red Hat Kernel Module Management Operator for Red Hat Openshift kmm/kernel-module-management-must-gather-rhel9 Red Hat Migration Toolkit for Containers rhmtc/openshift-migration-log-reader-rhel8, rhmtc/openshift-migration-must-gather-rhel8
    affected: workaround, no fix available
  • Red Hat Migration Toolkit for Virtualization migration-toolkit-virtualization/mtv-must-gather-rhel8, migration-toolkit-virtualization/mtv-must-gather-rhel9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Multicluster Engine for Kubernetes multicluster-engine/assisted-service-8-rhel8, multicluster-engine/assisted-service-9-rhel9, multicluster-engine/assisted-installer-controller-rhel8, multicluster-engine/assisted-installer-controller-rhel9 Red Hat Node HealthCheck Operator workload-availability/node-healthcheck-must-gather-rhel8, workload-availability/node-healthcheck-must-gather-rhel9
    affected: workaround, no fix available
  • Red Hat OpenShift Developer Tools and Services ocp-tools-4/jenkins-rhel8, ocp-tools-4/jenkins-rhel9, ocp-tools-4/jenkins-agent-base-rhel8, ocp-tools-4/jenkins-agent-base-rhel9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat OpenShift Lightspeed openshift-lightspeed/lightspeed-agentic-sandbox-rhel9
    affected: workaround, no fix planned “Will not fix”
  • Red Hat OpenShift Serverless openshift-serverless-1/kn-client-kn-rhel9, openshift-serverless-clients 1.17.0-4.el9, openshift-serverless-1/serverless-must-gather-rhel9, openshift-serverless-1/kn-plugin-func-func-util-rhel9 Red Hat OpenShift Service Mesh 3 openshift-service-mesh/istio-cni-rhel9, openshift-service-mesh/istio-pilot-rhel9 Red Hat Power monitoring for Red Hat OpenShift openshift-power-monitoring/power-monitoring-rhel9-operator
    affected: workaround, no fix available
  • Red Hat Ansible Automation Platform 2 ansible-automation-platform-25/ee-supported-rhel8, ansible-automation-platform-25/ee-supported-rhel9, ansible-automation-platform-26/ee-supported-rhel9, ansible-automation-platform-27/ee-supported-rhel9, ansible-automation-platform-24/aap-must-gather-rhel8, ansible-automation-platform-25/aap-must-gather-rhel8, +2 more
    affected: workaround, no fix available, no fix planned “Will not fix”
  • Red Hat Build of Podman Desktop rh-podman-desktop.git 1.1.0
    affected: workaround, no fix available
show 18 more
  • Red Hat Ceph Storage 9 rhceph/alloy-rhel10
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Certification Program for Red Hat Enterprise Linux 9 rhcertification/redhat-certification-baremetal, rhcertification/redhat-certification-system-ai-10
    affected: workaround, no fix available
  • Red Hat Developer Hub 1 rhdh/rhdh-must-gather-rhel9
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Enterprise Linux 9 ubi9/buildah Red Hat Enterprise Linux 10 ubi10/podman, ubi10/buildah, rhel10/rhel-bootc, rhel10-eus/rhel-10.0-bootc, rhel10-eus/rhel-10.2-bootc, rhel10/bootc-image-builder Red Hat OpenShift AI (RHOAI) rhoai/odh-ai-gateway-payload-processing-e2e-rhel9
    affected: workaround, no fix available
  • Red Hat OpenShift Container Platform 4 openshift-kni/commatrix, openshift4/cnf-tests-rhel8, openshift4/kube-compare-artifacts-rhel9, openshift4/ose-secrets-store-csi-mustgather-rhel8, openshift4/ose-secrets-store-csi-mustgather-rhel9
    affected: workaround, no fix available, no fix planned “Will not fix”
  • Red Hat OpenShift Container Platform 5 openshift-clients, openshift-kni/commatrix, openshift5/ose-cli-rhel9, openshift5/ose-tools-rhel9, openshift5/ose-deployer-rhel9, openshift5/ose-must-gather-rhel9, +5 more Red Hat Openshift Data Foundation 4 odf4/odf-must-gather-rhel9
    affected: workaround, no fix available
  • Red Hat OpenShift GitOps openshift-gitops-1/must-gather-rhel8, openshift-gitops-1/must-gather-rhel9
    affected: workaround, no fix available, no fix planned “Will not fix”
  • Red Hat OpenStack Platform 18.0 rhoso-operators/openstack-must-gather-rhel9, rhoso-operators/prometheus-podman-exporter-rhel9 Red Hat Quay 3 quay/quay-builder-rhel8, quay/quay-builder-rhel9 Red Hat Trusted Artifact Signer rhtas/ec-rhel9 Red Hat Web Terminal web-terminal/web-terminal-tooling-rhel9
    affected: workaround, no fix available
  • Red Hat Logging Subsystem for Red Hat OpenShift 6.6 openshift-logging/cluster-logging-rhel9-operator 1788439505
    fixed: vendor fix RHSA-2026:66521
  • Red Hat OpenShift API for Data Protection 1.5 oadp/oadp-mustgather-rhel9 1788859896
    fixed: vendor fix RHSA-2026:66022
  • Red Hat OpenShift Developer Tools and Services 1.6.4 source-to-image/source-to-image-rhel8 1790059956, source-to-image/source-to-image-rhel9 1790059977
    fixed: fixed in v1.6.4 RHSA-2026:69917
  • Red Hat Hardened Images buildah 1.45.0-2.hum1, podman 6.0.2-2.2.hum1, trivy 0.73.0-0.1.hum1, podmansh 6.0.2-2.2.hum1, podman-docker 6.0.2-2.2.hum1, podman-remote 6.0.2-2.2.hum1, +1 more
    fixed: vendor fix RHSA-2026:51065
  • Red Hat OpenShift AI 3.4 rhoai/odh-cli-rhel9 1791509689, rhoai/rhai-cli-rhel9 1791509689, rhoai/odh-must-gather-rhel9 1791351741, rhoai/odh-pipeline-runtime-minimal-cpu-py312-rhel9 1791829069, rhoai/odh-pipeline-runtime-pytorch-cuda-py312-rhel9 1791829182, rhoai/odh-pipeline-runtime-pytorch-rocm-py312-rhel9 1791868244, +9 more
    fixed: vendor fix RHSA-2026:84734
  • Red Hat Quay 3.16 quay/quay-rhel9 1789563753
    fixed: vendor fix RHSA-2026:69255
  • Red Hat Assisted Installer for Red Hat OpenShift Container Platform 2 assisted/agent-preinstall-image-builder-rhel9
    not affected: vulnerable code not present
  • Red Hat Confidential Compute Attestation build-of-trustee/trustee-must-gather-rhel9, openshift-sandboxed-containers/osc-must-gather-rhel9, openshift-sandboxed-containers/osc-podvm-builder-rhel9
    not affected: vulnerable code not in execute path
  • Red Hat Logging Subsystem for Red Hat OpenShift 6.6 openshift-logging/vector-rhel9 1788439747, openshift-logging/eventrouter-rhel9 1788375796, openshift-logging/logging-loki-rhel9 1788156390, openshift-logging/loki-rhel9-operator 1788154255, openshift-logging/opa-openshift-rhel9 1788153362, openshift-logging/loki-operator-bundle 1788158124, +3 more Red Hat Logical Volume Manager Storage lvms4/lvms-must-gather-rhel8, lvms4/lvms-must-gather-rhel9
    not affected: vulnerable code not present
  • Red Hat Migration Toolkit for Applications 8 mta/mta-cli-rhel9, mta/mta-discovery-addon-rhel9 Red Hat Multicluster Engine for Kubernetes multicluster-engine/must-gather-rhel9
    not affected: vulnerable code not in execute path

17 more not affected in the full advisory

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
2mo ago

Exploit prediction

0.54% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 4.0 7.2 CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
CNA 4.0 7.2 CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • moby buildkit

Classification

Weakness
  • CWE-22 Improper Limitation of a Pathname to a Restricted Directory

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.