CVE-2026-100703
Received Received - Intake

Information Disclosure in Kyverno via GlobalContextEntry Access

Publication date: 2026-09-26

Last updated on: 2026-09-26

Assigner: VulnCheck

Description
Kyverno 1.16.0 through 1.19.0 registers the globalcontext.Lib CEL library in its policy environment without confining it to the policy's namespace, unlike the sibling libraries (resource.Lib, http.Lib, configMap loader) which are handed the policy namespace. A tenant who can create a namespaced policy (e.g. NamespacedValidatingPolicy, and likewise the namespaced mutating, deleting, generating, and image-validating policy kinds) in their own namespace can call globalContext.get("<entry>", "") and receive the full cached contents of a cluster-scoped GlobalContextEntry, including data cached from namespaces the tenant has no RBAC permission to read. No admission validation rejects such calls. Fixed in 1.19.1.

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Meta Information

Published
2026-09-26
Last Modified
2026-09-26
Generated
2026-09-26
AI Q&A
2026-09-26
EPSS Evaluated
N/A
NVD
CVE-2026-100703
EUVD
EUVD-2026-87676

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
kyverno kyverno 1.19.1
kyverno kyverno From 1.16.0 (inc) to 1.19.0 (inc)
kyverno kyverno to 1.19.1 (exc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-200 The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

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Executive Summary

This vulnerability affects Kyverno versions 1.16.0 to 1.19.0. It involves the globalcontext.Lib CEL library not being properly confined to a policy's namespace. A tenant with permission to create a namespaced policy can use globalContext.get() to access the full cached contents of a cluster-scoped GlobalContextEntry, including data from namespaces they lack RBAC permissions to read.

Detection Guidance

To detect this vulnerability, check Kyverno versions between 1.16.0 and 1.19.0. Verify if namespaced policies can access cluster-scoped GlobalContextEntry data using globalContext.get(). Inspect Kyverno logs for unauthorized cross-namespace data access attempts.

Impact Analysis

An attacker with permission to create namespaced policies could retrieve sensitive data from cluster-scoped GlobalContextEntry objects across all namespaces, bypassing RBAC restrictions. This could lead to unauthorized access to confidential information stored in other namespaces.

Mitigation Strategies

Upgrade Kyverno to version 1.19.1 or later to patch the vulnerability. Review existing namespaced policies for unauthorized data access. Restrict policy creation permissions to trusted users only.

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