What’s Vulnerable › Vulnerabilities

CVE-2026-100707: Kyverno before 1.19.1 Namespace Isolation Bypass via Percent-Encoded Path

• Severity: high (CVSS 7.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-26 · updated 2026-09-28
• Weakness: CWE-22

Description

Kyverno before 1.19.1 contains a namespace isolation bypass in the apiCall context entry of namespaced Policy resources due to inconsistent path interpretation between validation and execution. A low-privilege tenant can use percent-encoded dot-segments in urlPath to bypass namespace checks and read resources from other namespaces using the Kyverno admission controller's ServiceAccount credentials.

Affected products

• kyverno: before 1.19.1 — fixed in 1.19.1

How to fix

Upgrade to a fixed version: kyverno 1.19.1. Check the vendor advisory for mitigations.

References

• https://github.com/kyverno/kyverno/security/advisories/GHSA-c5qq-7g2q-cpqp
• https://www.vulncheck.com/advisories/kyverno-before-1.19.1-namespace-isolation-bypass-via-percent-encoded-path

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