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Fencer Intel
high 7.5

CVE-2026-15789 json

Malicious client can bypass destination directory validation on local sources upload

published 3mo ago modified 16d ago also EUVD-2026-46309

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 24%
public exploits
0
none known

Summary

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 the BuildKit control API to issue builds, e.g., bypass authentication, etc.

Patch / fix

  • moby BuildKit 0.31.2
  • buildah RHEL 9 2:1.43.3-2.el9_8
  • buildah-tests RHEL 9 2:1.43.3-2.el9_8
  • podman hummingbird 1 6.0.2-2.3.hum1
  • podmansh hummingbird 1 6.0.2-2.3.hum1
  • podman-docker hummingbird 1 6.0.2-2.3.hum1
  • podman-remote hummingbird 1 6.0.2-2.3.hum1
  • podman-machine hummingbird 1 6.0.2-2.3.hum1
  • trivy hummingbird 1 0.74.0-0.2.hum1

red hat advisories RHSA-2026:70640RHSA-2026:62771RHSA-2026:66421RHSA-2026:51065

  • buildah AlmaLinux 9 2:1.43.3-2.el9_8
  • buildah-tests AlmaLinux 9 2:1.43.3-2.el9_8

almalinux advisories ALSA-2026:70640

  • buildah Rocky Linux 9 2:1.43.3-2.el9_8

rocky linux advisories RLSA-2026:70640

Is CVE-2026-15789 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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-2026-15789 updated cvss 6.5

buildkit: github.com/moby/buildkit: BuildKit: File escape vulnerability

  • Red Hat Assisted Installer for Red Hat OpenShift Container Platform 2 rhai/assisted-installer-controller-rhel9, assisted/agent-preinstall-image-builder-rhel9 Red Hat Compliance Operator compliance/openshift-compliance-must-gather-rhel8 Red Hat DPU kit for NVIDIA dpu-kit-for-nvidia/must-gather-rhel10 Red Hat Kernel Module Management Operator for Red Hat Openshift kmm/kernel-module-management-must-gather-rhel9
    affected: no fix available
  • Red Hat Logging Subsystem for Red Hat OpenShift openshift-logging/cluster-logging-rhel9-operator
    affected: no fix planned “Will not fix”
  • Red Hat Migration Toolkit for Applications 8 mta/mta-cli-rhel9, mta/mta-discovery-addon-rhel9 Red Hat Migration Toolkit for Containers rhmtc/openshift-migration-log-reader-rhel8, rhmtc/openshift-migration-must-gather-rhel8 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: no fix available
  • Red Hat OpenShift Developer Tools and Services ocp-tools-4/jenkins-agent-base-rhel8
    affected: no fix planned “Out of support scope”
  • Red Hat OpenShift Lightspeed openshift-lightspeed/lightspeed-agentic-sandbox-rhel9
    affected: 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 Power monitoring for Red Hat OpenShift openshift-power-monitoring/power-monitoring-rhel9-operator
    affected: no fix available
  • Red Hat Ansible Automation Platform 2 ansible-automation-platform-24/ee-supported-rhel8, ansible-automation-platform-24/ee-supported-rhel9, 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, +4 more
    affected: no fix available, no fix planned “Will not fix”
  • Red Hat Build of Kueue kueue/kueue-must-gather-rhel9 Red Hat Build of Podman Desktop rh-podman-desktop.git 1.1.0
    affected: no fix available
show 20 more
  • Red Hat Ceph Storage 9 rhceph/alloy-rhel10
    affected: 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: no fix available
  • Red Hat Developer Hub 1 rhdh/rhdh-must-gather-rhel9
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux 10 rhel10/rhel-bootc, rhel10-eus/rhel-10.0-bootc, rhel10-eus/rhel-10.2-bootc, rhel10/bootc-image-builder
    affected: no fix available, no fix planned “Out of support scope”
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-ai-gateway-payload-processing-e2e-rhel9
    affected: no fix available
  • Red Hat OpenShift Container Platform 4 openshift-clients, openshift-kni/commatrix, openshift4/ose-cli-rhel9, openshift4/cnf-tests-rhel8, openshift4/ose-tools-rhel9, openshift4/ose-deployer-rhel9, +13 more
    affected: 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, +4 more Red Hat Openshift Data Foundation 4 odf4/odf-must-gather-rhel9
    affected: no fix available
  • Red Hat OpenShift GitOps openshift-gitops-1/must-gather-rhel8, openshift-gitops-1/must-gather-rhel9
    affected: 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 Web Terminal web-terminal/web-terminal-tooling-rhel9
    affected: no fix available
  • 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 Enterprise Linux AppStream (v. 9) buildah 1.43.3-2.el9_8, buildah-tests 1.43.3-2.el9_8
    fixed: vendor fix RHSA-2026:70640
  • Red Hat Hardened Images buildah 1.45.0-2.hum1, podman 6.0.2-2.3.hum1, trivy 0.74.0-0.2.hum1, podmansh 6.0.2-2.3.hum1, podman-docker 6.0.2-2.3.hum1, podman-remote 6.0.2-2.3.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, +15 more
    fixed: vendor fix RHSA-2026:84734
  • Red Hat OpenShift AI 3.5 rhoai/odh-pipeline-runtime-minimal-cpu-py312-rhel9 1791572004, rhoai/odh-pipeline-runtime-pytorch-cuda-py312-rhel9 1791816462, rhoai/odh-pipeline-runtime-pytorch-rocm-py312-rhel9 1791951049, rhoai/odh-workbench-jupyter-minimal-cpu-py312-rhel9 1791572098, rhoai/odh-workbench-jupyter-minimal-cuda-py312-rhel9 1791572144, rhoai/odh-workbench-jupyter-minimal-rocm-py312-rhel9 1791572102, +12 more
    fixed: vendor fix RHSA-2026:86891
  • 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 Custom Metric Autoscaler operator for Red Hat Openshift custom-metrics-autoscaler/custom-metrics-autoscaler-rhel9-operator
    not affected: component not present
  • Red Hat Logical Volume Manager Storage lvms4/lvms-must-gather-rhel8, lvms4/lvms-must-gather-rhel9
    not affected: vulnerable code not in execute path
  • Red Hat Migration Toolkit for Virtualization migration-toolkit-virtualization/mtv-must-gather-rhel8, migration-toolkit-virtualization/mtv-must-gather-rhel9 Red Hat Multicluster Engine for Kubernetes multicluster-engine/must-gather-rhel9
    not affected: vulnerable code not present
  • Red Hat OpenShift Developer Tools and Services ocp-tools-4/jenkins-rhel8, ocp-tools-4/jenkins-rhel9, ocp-tools-4/jenkins-agent-base-rhel9
    not affected: vulnerable code not in execute path
  • Red Hat OpenShift Service Mesh 3 openshift-service-mesh/istio-cni-rhel9, openshift-service-mesh/istio-pilot-rhel9, openshift-service-mesh/istio-proxyv2-rhel9, openshift-service-mesh/istio-must-gather-rhel9 Red Hat Pen Drive Powered by Red Hat Lightspeed pen-drive/pen-drive-scanner-rhel9
    not affected: component not present

15 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
no
Technical impact
partial
Assessed
3mo ago

Exploit prediction

0.31% chance of exploitation in the next 30 days, higher than 24% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 4.0 6.9 CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
CNA 4.0 6.9 CVSS:4.0/AV:L/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
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

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.