CVE-2026-100706
published 2026-09-26CVE-2026-100706: kyverno before 1.19.1 fails to properly validate URL-encoded path segments in Policy apiCall urlPath, allowing namespace tenants to bypass the per-namespace…
PriorityP358critical9.9CVSS 3.1
AVNACLPRLUINSCCHIHAH
EPSS
0.61%
49.0th percentile
kyverno before 1.19.1 fails to properly validate URL-encoded path segments in Policy apiCall urlPath, allowing namespace tenants to bypass the per-namespace clamp and create objects in other namespaces as the admission-controller ServiceAccount. Attackers can exploit this by using percent-encoded directory traversal sequences to create MutatingWebhookConfiguration objects cluster-wide or PolicyException objects in the kyverno namespace, enabling privilege escalation to cluster admin.
Affected
1 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| kyverno | kyverno | < 1.19.1 | 1.19.1 |
CVSS provenance
nvdv3.19.9CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
nvdv4.09.4CRITICALCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vendor_redhat9.9CRITICAL
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Red Hat
github.com/kyverno/kyverno: kyverno before 1.19.1 Privilege Escalation via Policy apiCall urlPath
vendor_redhat·2026-09-26·CVSS 9.9
CVE-2026-100706 [CRITICAL] CWE-441 github.com/kyverno/kyverno: kyverno before 1.19.1 Privilege Escalation via Policy apiCall urlPath
github.com/kyverno/kyverno: kyverno before 1.19.1 Privilege Escalation via Policy apiCall urlPath
kyverno before 1.19.1 fails to properly validate URL-encoded path segments in Policy apiCall urlPath, allowing namespace tenants to bypass the per-namespace clamp and create objects in other namespaces as the admission-controller ServiceAccount. Attackers can exploit this by using percent-encoded directory traversal sequences to create MutatingWebhookConfiguration objects cluster-wide or PolicyException objects in the kyverno namespace, enabling privilege escalation to cluster admin.
A flaw was found in Kyverno. An authenticated user with namespace-level permissions can achieve privilege escalation to cluster administrator by supplying encoded path traversal sequences within policy requests.
VulDB
Kyverno up to 1.19.0 Policy urlPath path traversal
vuldb·2026-09-26·CVSS 9.9
CVE-2026-100706 [CRITICAL] Kyverno up to 1.19.0 Policy urlPath path traversal
A vulnerability was found in Kyverno up to 1.19.0. It has been classified as critical. This affects an unknown part of the component Policy. Performing a manipulation of the argument urlPath results in path traversal.
This vulnerability is cataloged as CVE-2026-100706. It is possible to initiate the attack remotely. There is no exploit available.
Upgrading the affected component is recommended.
GHSA
kyverno before 1.19.1 fails to properly validate URL-encoded path segments in Policy apiCall urlPath, allowing namespace tenants to bypass the per-namespace clamp and create objects in other namespace
ghsa_unreviewed·2026-09-26
CVE-2026-100706 [CRITICAL] CWE-441 kyverno before 1.19.1 fails to properly validate URL-encoded path segments in Policy apiCall urlPath, allowing namespace tenants to bypass the per-namespace clamp and create objects in other namespace
kyverno before 1.19.1 fails to properly validate URL-encoded path segments in Policy apiCall urlPath, allowing namespace tenants to bypass the per-namespace clamp and create objects in other namespaces as the admission-controller ServiceAccount. Attackers can exploit this by using percent-encoded directory traversal sequences to create MutatingWebhookConfiguration objects cluster-wide or PolicyException objects in the kyverno namespace, enabling privilege escalation to cluster admin.
No detection rules found.
No public exploits indexed.
2026-09-26
Published