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CVE-2026-100703— Kyverno before 1.19.1 Cross-Namespace Data Access via globalcontext.Lib

Quick assessment

Affected
kyverno kyverno
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Kyverno 1.16.0 至 1.19.0 版本在策略执行环境中注册了全局上下文（globalcontext）Lib CEL 库，但未将其限制在策略所属的命名空间中。与此形成对比的是，其他同级库（如 resource.Lib、http.Lib 和 configMap 加载器）在初始化时均接收了策略所在命名空间的上下文信息。 因此，任何能够在其自有命名空间中创建命名空间级策略（例如 NamespacedValidatingPolicy，以及同类的命名空间级 MutatingPolicy、DeletingPolic

CVSS 7.7 · High EPSS 0.23% · P12
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I. Basic Information for CVE-2026-100703

Vulnerability Information
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Vulnerability Title
Kyverno before 1.19.1 Cross-Namespace Data Access via globalcontext.Lib
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
kyverno kyverno 1.16.0 ~ 1.19.1 -

II. Public POCs for CVE-2026-100703

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III. Intelligence Information for CVE-2026-100703

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Vendor Advisories for CVE-2026-100703 (1)

Other References for CVE-2026-100703 (1)

Same Patch Batch · kyverno · 2026-09-26 · 5 CVEs total

CVE-2026-100706 9.9 CRITICAL kyverno before 1.19.1 Privilege Escalation via Policy apiCall urlPath
CVE-2026-100704 7.7 HIGH Kyverno before 1.19.1 ImageValidatingPolicy Exception Bypass
CVE-2026-100707 7.7 HIGH Kyverno before 1.19.1 Namespace Isolation Bypass via Percent-Encoded Path
CVE-2026-100705 7.6 HIGH Kyverno before 1.19.1 SSRF via legacy apiCall service executor

IV. Related Vulnerabilities

Same product: kyverno
Same vendor: kyverno
Same weakness: CWE-200

V. Comments for CVE-2026-100703

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