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CVE-2026-122304— Kyverno 1.17.0 before 1.19.2 Privilege Escalation via CleanupPolicy Context Loader

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 1.17.0 至 1.19.2（不含 1.19.2）版本中存在一个授权绕过漏洞。由于清理控制器（cleanup controller）在构建其上下文加载器时使用了空策略（nil policy），导致命名空间管理员能够突破命名空间隔离限制。攻击者可创建带有 或 上下文条目的命名空间级 CleanupPolicy，利用清理控制器的 ServiceAccount 读取跨命名空间的 Secret，并修改 ValidatingWebhookConfiguration。

CVSS 9.9 · Critical
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I. Basic Information for CVE-2026-122304

Vulnerability Information
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Vulnerability Title
Kyverno 1.17.0 before 1.19.2 Privilege Escalation via CleanupPolicy Context Loader
Source: CVE Program / CVE List V5
Vulnerability Description
Kyverno from 1.17.0 before 1.19.2 contains an authorization bypass vulnerability that allows namespace admins to escape namespace confinement because the cleanup controller builds its context loader with a nil policy. Attackers can create a namespaced CleanupPolicy with apiCall or globalReference context entries to read cross-namespace Secrets and modify validatingwebhookconfigurations using the cleanup controller's ServiceAccount.
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
授权机制不正确
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
kyverno kyverno 1.17.0 ~ 1.19.2 -

II. Public POCs for CVE-2026-122304

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III. Intelligence Information for CVE-2026-122304

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Other References for CVE-2026-122304 (3)

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-2026-122311 9.9 CRITICAL Kyverno 1.16.0 before 1.19.2 Path Traversal in Namespaced CEL Policies via resource argume
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-863