Vulnerability 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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/kyverno/kyverno/security/advisories/GHSA-59v6-2x73-wfg4
- https://www.vulncheck.com/advisories/kyverno-before-1.19.1-cross-namespace-data-
FAQ
What is CVE-2026-100703?
CVE-2026-100703 is a vulnerability with a CVSS score of 7.7 (HIGH). 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...
How severe is CVE-2026-100703?
CVE-2026-100703 has been rated HIGH with a CVSS base score of 7.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-100703?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.