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Fencer Vulns
medium 5.8

CVE-2026-24137 json

sigstore legacy TUF client allows for arbitrary file writes with target cache path traversal

published 2026-01-22 9 mo ago modified 2026-09-10 1 mo ago also EUVD-2026-3781 , GHSA-fcv2-xgw5-pqxf , GO-2026-4358

cvss
5.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 33%
public exploits
0
none known

Summary

sigstore framework is a common go library shared across sigstore services and clients. In versions 1.10.3 and below, the legacy TUF client (pkg/tuf/client.go) supports caching target files to disk. It constructs a filesystem path by joining a cache base directory with a target name sourced from signed target metadata; however, it does not validate that the resulting path stays within the cache base directory. A malicious TUF repository can trigger arbitrary file overwriting, limited to the permissions that the calling process has. Note that this should only affect clients that are directly using the TUF client in sigstore/sigstore or are using an older version of Cosign. Public Sigstore deployment users are unaffected, as TUF metadata is validated by a quorum of trusted collaborators. This issue has been fixed in version 1.10.4. As a workaround, users can disable disk caching for the legacy client by setting SIGSTORE_NO_CACHE=true in the environment, migrate to https://github.com/sigstore/sigstore-go/tree/main/pkg/tuf, or upgrade to the latest sigstore/sigstore release.

Patch / fix

  • go github.com/sigstore/sigstore 1.10.4
  • sigstore sigstore 1.10.4
  • golang-github-sigstore-sigstore Debian 14 1.10.4-1

debian advisories DEBIAN-CVE-2026-24137

  • apptainer SLES 15 SP6-LTSS, SLE Module for HPC 15 SP7 1.5.1-150600.4.24.1
  • cosign SLES for SAP applications 16.0, SLES 16.0 3.0.5-160000.1.1
  • cosign SLE Module for Basesystem 15 SP7, openSUSE Leap 15.6 3.0.5-150400.3.35.1
  • govulncheck-vulndb openSUSE Leap 15.6 0.0.20260226T182644-150000.1.149.1
  • vexctl openSUSE Leap 15.6 0.4.1+git78.f951e3a-150000.1.11.1

suse advisories SUSE-SU-2026:2609-1SUSE-SU-2026:20904-1SUSE-SU-2026:0777-1SUSE-SU-2026:0757-1SUSE-SU-2026:0592-1

  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
  • vexctl openSUSE Leap 16.0 0.4.4+git20.5d61136-160000.1.1
  • apptainer openSUSE Tumbleweed 1.4.5-4.1
  • cosign openSUSE Leap 16.0 3.0.5-160000.1.1
  • cosign openSUSE Tumbleweed 3.0.5-1.1
  • vexctl openSUSE Tumbleweed 0.4.1+git78.f951e3a-1.1

opensuse advisories openSUSE-SU-2026:21483-1openSUSE-SU-2026:21481-1openSUSE-SU-2026:10700-1openSUSE-SU-2026:20386-1openSUSE-SU-2026:10235-1openSUSE-SU-2026:10230-1

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-2026-24137 updated cvss 5.8

github.com/sigstore/sigstore: sigstore legacy TUF client allows for arbitrary file writes with target cache path traversal

  • Red Hat Assisted Installer for Red Hat OpenShift Container Platform 2 assisted/agent-preinstall-image-builder-rhel9 Red Hat Confidential Compute Attestation openshift-sandboxed-containers/osc-must-gather-rhel9 Red Hat Kernel Module Management Operator for Red Hat Openshift kmm/kernel-module-management-must-gather-rhel9 Red Hat Logging Subsystem for Red Hat OpenShift openshift-logging/cluster-logging-rhel9-operator Red Hat Migration Toolkit for Containers rhmtc/openshift-migration-controller-rhel8, rhmtc/openshift-migration-log-reader-rhel8, rhmtc/openshift-migration-must-gather-rhel8 Red Hat Migration Toolkit for Virtualization mtv-candidate/mtv-must-gather-rhel8, migration-toolkit-virtualization/mtv-must-gather-rhel8
    +17 more products
    Red Hat Multiarch Tuning Operator multiarch-tuning/multiarch-tuning-rhel9-operator, multiarch-tuning/multiarch-tuning-operator-bundle Red Hat Multicluster Engine for Kubernetes multicluster-engine/must-gather-rhel9 Red Hat Network Observability Operator network-observability/network-observability-cli-rhel9 Red Hat Node HealthCheck Operator workload-availability/node-healthcheck-must-gather-rhel9 Red Hat OpenShift API for Data Protection oadp/oadp-mustgather-rhel9, oadp/oadp-velero-plugin-rhel8, oadp/oadp-velero-plugin-rhel9 Red Hat OpenShift Developer Tools and Services openshift4/ose-jenkins, ocp-tools-4/jenkins-rhel8, ocp-tools-4/jenkins-rhel9, ocp-tools-4/jenkins-agent-base-rhel8, ocp-tools-4/jenkins-agent-base-rhel9 Red Hat OpenShift Pipelines openshift-pipelines/pipelines-nop-rhel8, openshift-pipelines/pipelines-opc-rhel9, openshift-pipelines/pipelines-events-rhel8, openshift-pipelines/pipelines-hub-ui-rhel8, openshift-pipelines/pipelines-cli-tkn-rhel8, openshift-pipelines/pipelines-cli-tkn-rhel9, +18 more Red Hat OpenShift Serverless openshift-serverless-1/kn-plugin-event-sender-rhel9, openshift-serverless-1/serverless-must-gather-rhel9 Red Hat OpenShift Service Mesh 2 openshift-service-mesh/istio-must-gather-rhel9 Red Hat OpenShift Service Mesh 3 openshift-service-mesh/istio-must-gather-rhel9 Red Hat Pen Drive Powered by Red Hat Lightspeed pen-drive/pen-drive-scanner-rhel9 Red Hat Power monitoring for Red Hat OpenShift openshift-power-monitoring/power-monitoring-rhel9-operator Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/acm-must-gather-rhel9, rhacm2/submariner-rhel9-operator, rhacm2/submariner-operator-bundle Red Hat Advanced Cluster Security 4 advanced-cluster-security/rhacs-main-rhel8, advanced-cluster-security/rhacs-roxctl-rhel8, advanced-cluster-security/rhacs-rhel8-operator, advanced-cluster-security/rhacs-central-db-rhel8, advanced-cluster-security/rhacs-scanner-v4-rhel8, advanced-cluster-security/rhacs-scanner-v4-db-rhel8 Red Hat Ansible Automation Platform 2 ansible-automation-platform-24/aap-must-gather-rhel8, ansible-automation-platform-25/aap-must-gather-rhel8, ansible-automation-platform-26/aap-must-gather-rhel9 Red Hat Build of Kueue kueue/kueue-must-gather-rhel9 Red Hat Build of Podman Desktop - Tech Preview rhdesktop/rh-podman-desktop-ext-rhel-rhel10, rhdesktop/rh-podman-desktop-ext-bootc-rhel10
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Enterprise Linux 9 rhel9/bootc-image-builder, rhel9-eus/rhel-9.6-bootc-image-builder
    affected: workaround, no fix available, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 10 podman, skopeo, buildah, rhel10/bootc-image-builder, rhel10-eus/rhel-10.0-bootc-image-builder Red Hat OpenShift AI (RHOAI) rhoai/odh-must-gather-rhel9, rhoai/odh-pipeline-runtime-minimal-cpu-py312-rhel9, rhoai/odh-pipeline-runtime-pytorch-cuda-py312-rhel9, rhoai/odh-pipeline-runtime-pytorch-rocm-py312-rhel9, rhoai/odh-workbench-jupyter-minimal-cpu-py312-rhel9, rhoai/odh-workbench-jupyter-minimal-cuda-py312-rhel9, +13 more Red Hat OpenShift Container Platform 4 openshift4/ose-cli, openshift4/ose-deployer, openshift4/ose-cli-rhel9, openshift4/cnf-tests-rhel8, openshift4/cnf-tests-rhel9, openshift4/ose-tests-rhel9, +30 more Red Hat Openshift Data Foundation 4 odf4/odf-must-gather-rhel9, odf4/odf-cloudnative-pg-rhel9-operator Red Hat OpenShift Dev Spaces devspaces/udi-base-rhel10 Red Hat OpenShift GitOps openshift-gitops-1/must-gather-rhel8
    +7 more products
    Red Hat OpenShift Virtualization 4 kubevirt-tekton-tasks-test-rhel9-container, container-native-virtualization/kubevirt-tekton-tasks-create-datavolume-rhel9, container-native-virtualization/kubevirt-tekton-tasks-disk-virt-customize-rhel9 Red Hat OpenStack Platform 18.0 rhoso-operators/prometheus-podman-exporter-rhel9 Red Hat Quay 3 quay/quay-builder-rhel8, quay/quay-builder-rhel9 Red Hat Trusted Artifact Signer rhtas/cosign-rhel9, rhtas/fulcio-rhel9, rhtas/gitsign-rhel9, rhtas/rekor-cli-rhel9, rhtas/rekor-server-rhel9, rhtas/client-server-rhel9, +7 more Red Hat Security Profiles Operator compliance/openshift-security-profiles-rhel8-operator, compliance/openshift-security-profiles-operator-bundle Red Hat Zero Trust Workload Identity Manager zero-trust-workload-identity-manager/spiffe-spire-agent-rhel9, zero-trust-workload-identity-manager/spiffe-spire-server-rhel9, zero-trust-workload-identity-manager/spiffe-spire-oidc-discovery-provider-rhel9 Red Hat Zero Trust Workload Identity Manager - Tech Preview zero-trust-workload-identity-manager/spiffe-spire-agent-rhel9, zero-trust-workload-identity-manager/spiffe-spire-server-rhel9, zero-trust-workload-identity-manager/spiffe-spire-oidc-discovery-provider-rhel9, zero-trust-workload-identity-manager/zero-trust-workload-identity-manager-rhel9, zero-trust-workload-identity-manager/zero-trust-workload-identity-manager-operator-bundle
    affected: workaround, no fix available “Fix deferred”

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
9 mo ago

Exploit prediction

0.39% chance of exploitation in the next 30 days, higher than 33% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.8 CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:N/I:H/A:N
GitHub 3.1 5.8 CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:N/I:H/A:N

Affected packages

ecosystem package affected fixed in
go github.com/sigstore/sigstore
<1.10.4
1.10.4

Affected products

  • sigstore sigstore

Classification

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

References

Sources

Fencer Vulns 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.