CVE-2026-100707

HIGH 7.7

Kyverno before 1.19.1 Namespace Isolation Bypass via Percent-Encoded Path

CVSS Score

7.7

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-22
Vendor	kyverno
Product	kyverno
Published	Sep 26, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

None

Availability

None

Affected Versions

kyverno / kyverno

0 < 1.19.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

🔍 dhki