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Fencer Vulns
medium 6.5

CVE-2025-32387 json

Helm Allows A Specially Crafted JSON Schema To Cause A Stack Overflow

published 2025-04-09 19 mo ago modified 2026-09-10 1 mo ago also BIT-helm-2025-32387 , EUVD-2025-10671 , GHSA-5xqw-8hwv-wg92 , GO-2025-3602

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 43%
public exploits
0
none known

Summary

Helm is a package manager for Charts for Kubernetes. A JSON Schema file within a chart can be crafted with a deeply nested chain of references, leading to parser recursion that can exceed the stack size limit and trigger a stack overflow. This issue has been resolved in Helm v3.17.3.

Patch / fix

  • go helm.sh/helm/v3 3.17.3
  • bitnami helm 3.17.3
  • helm helm 3.17.3
  • terraform-provider-aws SLE Module for Public Cloud 15 SP5, SLE Module for Public Cloud 15 SP4 3.11.0-150200.6.18.1
  • terraform-provider-tls SLE Module for Public Cloud 15 SP5, SLE Module for Public Cloud 15 SP4 3.0.0-150200.5.15.1
  • terraform-provider-helm SLE Module for Public Cloud 15 SP5, SLE Module for Public Cloud 15 SP4 2.9.0-150200.6.23.1
  • terraform-provider-null SLE Module for Public Cloud 15 SP5, SLE Module for Public Cloud 15 SP4 3.0.0-150200.6.18.1
  • terraform-provider-local SLE Module for Public Cloud 15 SP5, SLE Module for Public Cloud 15 SP4 2.0.0-150200.6.17.1
  • terraform-provider-google SLE Module for Public Cloud 15 SP5, SLE Module for Public Cloud 15 SP4 3.43.0-150200.6.12.1
  • terraform-provider-random SLE Module for Public Cloud 15 SP5, SLE Module for Public Cloud 15 SP4 3.0.0-150200.6.15.1
  • terraform-provider-azurerm SLE Module for Public Cloud 15 SP5, SLE Module for Public Cloud 15 SP4 2.32.0-150200.6.12.1

suse advisories SUSE-SU-2026:3056-1SUSE-SU-2025:01830-2SUSE-SU-2025:01830-1

  • govulncheck-vulndb openSUSE Tumbleweed 0.0.20250410T162706-1.1

opensuse advisories openSUSE-SU-2025:14995-1

  • cert-manager Azure Linux 3.0 1.12.15-4

azure linux advisories AZL-59979

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

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-2025-32387 updated cvss 6.5

helm.sh/helm/v3: Helm Allows A Specially Crafted JSON Schema To Cause A Stack Overflow

  • Red Hat cert-manager Operator for Red Hat OpenShift cert-manager/jetstack-cert-manager-rhel9, cert-manager/jetstack-cert-manager-acmesolver-rhel9 Red Hat Deployment Validation Operator dvo/deployment-validation-rhel8-operator Red Hat Multicluster Global Hub multicluster-globalhub/multicluster-globalhub-agent-rhel9, multicluster-globalhub/multicluster-globalhub-manager-rhel9, multicluster-globalhub/multicluster-globalhub-rhel9-operator, multicluster-globalhub/multicluster-globalhub-operator-bundle Red Hat OpenShift Service Mesh 2 openshift-service-mesh/pilot-rhel8, openshift-service-mesh/proxyv2-rhel8, openshift-service-mesh/proxyv2-rhel9, openshift-service-mesh/istio-cni-rhel8 Red Hat OpenShift Service Mesh 3 openshift-service-mesh/istio-proxyv2-rhel9, openshift-service-mesh/istio-rhel9-operator, openshift-service-mesh/istio-must-gather-rhel9 Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/acm-search-v2-rhel9, rhacm2/multiclusterhub-rhel9, rhacm2/multicloud-integrations-rhel9, rhacm2/acm-volsync-addon-controller-rhel9, rhacm2/multicluster-operators-channel-rhel9, rhacm2/multicluster-operators-subscription-rhel9, +2 more
    +4 more products
    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 Developer Hub 1 rhdh-orchestrator-dev-preview-beta/controller-rhel9-operator Red Hat OpenShift AI (RHOAI) rhoai/odh-kueue-controller-rhel8 Red Hat Trusted Application Pipeline rhtap-cli/rhtap-cli-rhel9
    affected: workaround, no fix available “To mitigate this vulnerability, ensure that the JSON Schema within any charts loaded by Helm does not have a large number of nested references. These JSON Schema files are larger than 10 MiB.”

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
18 mo ago

Exploit prediction

0.50% chance of exploitation in the next 30 days, higher than 43% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
GitHub 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
OSV 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
go helm.sh/helm/v3
<3.17.3
3.17.3
bitnami helm
<3.17.3
3.17.3

Affected products

  • helm helm

Classification

Weakness

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.