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    CVE-2026-100706

    kyverno before 1.19.1 fails to properly validate URL-encoded path segments in Policy apiCall urlPath, allowing namespace tenants to bypass the per-namespace clamp and create objects in other namespaces as the admission-controller ServiceAccount. Attackers can exploit this by using percent-encoded directory traversal sequences to create MutatingWebhookConfiguration objects cluster-wide or PolicyException objects in the kyverno namespace, enabling privilege escalation to cluster admin.

    Published:Sep 26, 2026
    Last Modified:Sep 26, 2026
    EPS:Sep 26, 2026
    EPSS Score:
    CVSS Score:9.9

    Affected Products

    Vendor
    Kyverno
    Product
    Kyverno

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-441 Unintended Proxy or Intermediary

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-219 XML Routing Detour Attacks
    CAPEC-465 Transparent Proxy Abuse

    Related CVEs

    CVE-2026-100707 (CVSS 8.3) — Kyverno before 1.19.1 contains a namespace isolation bypass in the apiCall context entry of namespaced Policy …
    CVE-2026-100705 (CVSS 8.3) — Kyverno before 1.19.1 is vulnerable to server-side request forgery. The default egress blocklist (169.254.169.…
    CVE-2026-100704 (CVSS 8.3) — Kyverno is a policy engine for Kubernetes. In versions 1.14.0 through 1.19.0, the ImageValidatingPolicy (polic…
    CVE-2026-100703 (CVSS 8.3) — Kyverno 1.16.0 through 1.19.0 registers the globalcontext.Lib CEL library in its policy environment without co…
    CVE-2026-84200 (CVSS 9.4) — Kyverno versions v1.9.0 through v1.12.7 contain a policy exception handling flaw. When a policy in enforce mod…
    CVE-2026-84199 (CVSS 6.9) — Kyverno before 1.16.2 contains a server-side request forgery (SSRF) vulnerability in the APICall feature. The …
    CVE-2026-84196 (CVSS 8.3) — Kyverno before 1.18.0 contains a server-side request forgery vulnerability in apiCall.service.url that allows …
    CVE-2026-84195 (CVSS 8.3) — Kyverno before 1.16.4 automatically attaches the admission controller's ServiceAccount token to outbound HTTP …
    CVE-2025-15613 (CVSS 6.9) — Kyverno before v1.13.4 is vulnerable to server-side request forgery (SSRF) via its Service Call functionality.…
    CVE-2023-54356 (CVSS 9.3) — Kyverno versions 1.9.4 and earlier support insecure 3DES cipher suites (TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA an…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High