Information disclosure in Kyverno
CVE-2026-100703
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.
Vulnerability class: Information Disclosure
Published .
CVSS v3 metric
CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/kyverno/kyverno/security/advisories/GHSA-59v6-2x73-wfg4 (vendor-advisory)
- www.vulncheck.com/advisories/kyverno-before-1.19.1-cross-namespace-data-access-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-100703?
- CVE-2026-100703 is a high-severity vulnerability in Kyverno, classified under Information Disclosure. CVSS score: 7.7/10. Published 2026-09-26.
- How severe is CVE-2026-100703?
- High severity. CVSS v3 base score is 7.7 out of 10.