Description
Kyverno from 1.19.1 before 1.19.2 validates a Policy's context.apiCall urlPath after cleaning it but executes the raw path, whose fragment or query the Kubernetes client discards. A namespace-scoped user who can create a Policy can hide ../ segments behind # or ? to reach cluster-scoped endpoints with Kyverno's ServiceAccount, gaining cluster admin.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| kyverno | kyverno | 1.19.1 – < 1.19.2 | 1.19.2 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | kyverno-1.17 | 1.17.2-r46 | — |
| Wolfi rolling | kyverno-1.18 | No fix yet | — |
Advisories 1
- WID-SEC-2026-4096 Kyverno: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 4, 2026
References
- GitHub Security Advisory (GHSA-3xfv-vq8x-qhg4) vendor-advisory
- VulnCheck Advisory: Kyverno 1.19.1 before 1.19.2 Privilege Escalation via Policy apiCall urlPath third-party-advisory