CVE-2026-122311— Kyverno 1.16.0 before 1.19.2 Path Traversal in Namespaced CEL Policies via resource argument

Quick assessment

Affected

kyverno kyverno

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Kyverno 1.16.0 至 1.19.2 之前的版本在和的资源参数中未能正确验证路径段，导致命名空间级别的 CEL 策略能够突破其所属命名空间的限制。拥有创建权限的租户可通过插入路径段，利用准入控制器的 ServiceAccount 读取和写入任意集群对象，进而实现对整个集群的接管。

CVSS 9.9 · Critical Updated Nov 05, 2026

Possible ATT&CK Techniques 2 AI

T1548.001 · Setuid and Setgid T1203 · Exploitation for Client Execution

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Vulnerability Information

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Vulnerability Title

Kyverno 1.16.0 before 1.19.2 Path Traversal in Namespaced CEL Policies via resource argument

Source: CVE Program / CVE List V5

Vulnerability Description

Kyverno from 1.16.0 before 1.19.2 fails to validate path segments in the resource argument of resource.get() and resource.post(), allowing namespaced CEL policies to escape their namespace. Tenants who can create a NamespacedValidatingPolicy can insert .. segments to read and write arbitrary cluster objects using the admission controller's ServiceAccount, leading to cluster takeover.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Source: CVE Program / CVE List V5

Vulnerability Type

对路径名的限制不恰当(路径遍历)

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
kyverno	kyverno	1.16.0 ~ 1.19.2	-

II. Public POCs for CVE-2026-122311

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-122311

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Other References for CVE-2026-122311 (2)

https://github.com/kyverno/kyverno/security/advisories/GHSA-4pqm-wqq6-h9q2 vendor-advisory
https://www.vulncheck.com/advisories/kyverno-1.16.0-before-1.19.2-path-traversal-in-namespaced-cel-policies-via-resource-argument third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-122311

Same Patch Batch · kyverno · 2026-11-05 · 21 CVEs total

CVE-2026-122313	9.9 CRITICAL	Kyverno 1.17.0 before 1.19.2 Cross-Namespace Privilege Escalation via NamespacedMutatingPo
CVE-2026-122310	9.9 CRITICAL	Kyverno 1.19.1 before 1.19.2 Privilege Escalation via Policy apiCall urlPath
CVE-2026-122303	9.9 CRITICAL	Kyverno 1.17.0 before 1.19.2 Cross-Namespace Resource Overwrite via NamespacedMutatingPoli
CVE-2026-122304	9.9 CRITICAL	Kyverno 1.17.0 before 1.19.2 Privilege Escalation via CleanupPolicy Context Loader
CVE-2026-122302	9.8 CRITICAL	Kyverno before 1.19.2 Privilege Escalation via Generate Rule Permission Check
CVE-2026-122321	9.1 CRITICAL	Kyverno 1.18.0 before 1.19.2 verifyImages Cache Signature Verification Bypass
CVE-2026-122308	8.5 HIGH	Kyverno before 1.19.2 Label Spoofing via Generation Handler processRequest
CVE-2026-122316	8.5 HIGH	Kyverno 1.17.0 before 1.19.2 Cross-Namespace Write via NamespacedMutatingPolicy mutateExis
CVE-2026-122320	7.7 HIGH	Kyverno before 1.19.2 Cross-Namespace Resource Read via generate.clone
CVE-2026-122307	7.7 HIGH	Kyverno before 1.19.2 Policy Bypass via admissionpolicygenerator PolicyException Handling
CVE-2026-122318	7.7 HIGH	Kyverno before 1.19.2 Cosign Identity Check Bypass via Empty SAN Certificates
CVE-2026-122306	7.7 HIGH	Kyverno before 1.19.2 Denial of Service via Exponential-Time Wildcard Matching
CVE-2026-122312	7.7 HIGH	Kyverno 1.19.1 before 1.19.2 Namespace Isolation Bypass via APICall URLPath Query String
CVE-2026-122305	7.7 HIGH	Kyverno before 1.19.2 Denial of Service via Nested Variable Substitution Loop
CVE-2026-122319	7.5 HIGH	Kyverno before 1.19.2 Denial of Service via In/NotIn Operator Panic
CVE-2026-122322	7.5 HIGH	Kyverno from 1.11.0 before 1.19.2 Memory Exhaustion via Notary Attestation Decompression
CVE-2026-122323	7.5 HIGH	Kyverno 1.11.0 before 1.19.2 Memory Exhaustion via Notary Signature Decompression
CVE-2026-122314	7.5 HIGH	Kyverno before 1.19.2 Denial of Service via Shallow Variable Substitution Panic
CVE-2026-122315	7.5 HIGH	Kyverno before 1.19.2 Image Verification Bypass via Attestation Type Panic
CVE-2026-122309	6.2 MEDIUM	Kyverno before 1.19.2 Denial of Service via Unbounded CEL Policy Evaluation Cost

IV. Related Vulnerabilities

Same product: kyverno

Same vendor: kyverno

Same weakness: CWE-22