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 · last modified .
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
EPSS: 0.005 (40.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 40.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
Weakness classification (CWE)
References
- GitHub Security Advisory (GHSA-c5qq-7g2q-cpqp) (vendor-advisory)
- VulnCheck Advisory: Kyverno before 1.19.1 Namespace Isolation Bypass via Percent-Encoded Path (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.