Path Traversal in Kyverno
CVE-2026-100707
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.
Vulnerability class: Path Traversal (Directory Traversal)
Published .
CVSS v3 metric
CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/kyverno/kyverno/security/advisories/GHSA-c5qq-7g2q-cpqp (vendor-advisory)
- www.vulncheck.com/advisories/kyverno-before-1.19.1-namespace-isolation-bypass-v… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-100707?
- CVE-2026-100707 is a high-severity vulnerability in Kyverno, classified under Path Traversal. CVSS score: 7.7/10. Published 2026-09-26.
- How severe is CVE-2026-100707?
- High severity. CVSS v3 base score is 7.7 out of 10.