CVE-2026-122316— Kyverno 1.17.0 before 1.19.2 Cross-Namespace Write via NamespacedMutatingPolicy mutateExisting

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）版本中，其后台处理器（mutate-existing background processor）存在授权缺失漏洞。该漏洞允许命名空间租户修改其命名空间之外的资源。攻击者可通过 CEL 表达式创建针对 Namespace 对象或目标命名空间资源的 NamespacedMutatingPolicy，进而导致后台控制器（background-controller）的 ServiceAccount 在全集群范围内移除 Pod 安全标签。

CVSS 8.5 · High Updated Nov 05, 2026

Possible ATT&CK Techniques 2 AI

T1548 · Abuse Elevation Control Mechanism T1068 · Exploitation for Privilege Escalation

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Vulnerability Information

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Vulnerability Title

Kyverno 1.17.0 before 1.19.2 Cross-Namespace Write via NamespacedMutatingPolicy mutateExisting

Source: CVE Program / CVE List V5

Vulnerability Description

Kyverno from 1.17.0 before 1.19.2 contains a missing authorization vulnerability in the mutate-existing background processor that allows namespaced tenants to modify resources outside their namespace. Attackers can create a NamespacedMutatingPolicy targeting Namespace objects or victim-namespace resources via CEL expressions, making the background-controller ServiceAccount strip Pod Security labels cluster-wide.

Source: CVE Program / CVE List V5

CVSS Information

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

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-2026-122316

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-122316

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Other References for CVE-2026-122316 (2)

https://github.com/kyverno/kyverno/security/advisories/GHSA-vm98-8c25-h274 vendor-advisory
https://www.vulncheck.com/advisories/kyverno-1.17.0-before-1.19.2-cross-namespace-write-via-namespacedmutatingpolicy-mutateexisting third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-122316

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-2026-122303	9.9 CRITICAL	Kyverno 1.17.0 before 1.19.2 Cross-Namespace Resource Overwrite via NamespacedMutatingPoli
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-2026-122320	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