CVE-2026-100707 Kyverno before 1.19.1 Namespace Isolation Bypass via Percent-Encoded Path
Low-privilege tenants can bypass namespace isolation via percent-encoded paths to read cross-namespace resources using Kyverno's service account.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-100707?
CVE-2026-100707 is a high-severity path traversal vulnerability in kyverno, published on 26 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-22
Which versions are affected by CVE-2026-100707?
1 open source package ship an affected version, including kyverno.
| Package | Affected | Fixed in |
|---|---|---|
kyverno Bitnami | All versions | 1.19.1 |
How do I fix CVE-2026-100707?
Upgrade kyverno to 1.19.1 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-100707 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-100707 exists.
Sources
Also known as BIT-kyverno-2026-100707, GHSA-66wc-m66q-pf76, GHSA-c5qq-7g2q-cpqp, MINI-2x67-frr5-6657, MINI-39mw-xcpf-9wh9, MINI-84vm-hjwj-2v45 and 10 more.