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CVE-2026-122303— Kyverno 1.17.0 before 1.19.2 Cross-Namespace Resource Overwrite via NamespacedMutatingPolicy

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）版本存在一个授权绕过漏洞。该漏洞允许命名空间租户利用 中的 策略的 字段，通过返回一个由攻击者构造的 CEL 映射字面量（map literal），伪造目标资源的 属性，从而诱使拥有高权限的后端控制器在集群范围内覆盖其他命名空间中的 Secret、Deployment 或策略等资源。

CVSS 9.9 · Critical
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I. Basic Information for CVE-2026-122303

Vulnerability Information
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Vulnerability Title
Kyverno 1.17.0 before 1.19.2 Cross-Namespace Resource Overwrite via NamespacedMutatingPolicy
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 tenants to overwrite resources in other namespaces via NamespacedMutatingPolicy mutate-existing targetMatchConstraints.expression. Attackers can return a CEL map literal fabricating a target with an attacker-chosen metadata.namespace, causing the privileged background controller to overwrite Secrets, Deployments, or policies cluster-wide.
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
授权机制缺失
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-2026-122303

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III. Intelligence Information for CVE-2026-122303

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Other References for CVE-2026-122303 (2)

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-2026-122304 9.9 CRITICAL Kyverno 1.17.0 before 1.19.2 Privilege Escalation via CleanupPolicy Context Loader
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-862