CVE-2026-122321— Kyverno 1.18.0 before 1.19.2 verifyImages Cache Signature Verification Bypass

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 1.18.0 至 1.19.2 之前的版本中，功能存在签名验证绕过漏洞。该漏洞的根源在于：缓存的验证结果是以镜像引用字符串（例如标签）作为索引，而非绑定到已验证的镜像摘要（digest）。因此，当发生缓存命中时，系统会跳过签名和声明（attestation）检查。攻击者若能提交工作负载并操纵镜像仓库标签，可先使用已签名的镜像“预热”缓存，随后将该标签重新指向另一个未签名的镜像。此时，Kyverno 会因缓存命中而错误地允许该工作负载通过验证，并利用功能将未经验证的镜像摘要固定下来，从而绕过安全

CVSS 9.1 · Critical Updated Nov 05, 2026

Possible ATT&CK Techniques 2 AI

T1548.001 · Setuid and Setgid T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

Kyverno 1.18.0 before 1.19.2 verifyImages Cache Signature Verification Bypass

Source: CVE Program / CVE List V5

Vulnerability Description

Kyverno 1.18.0 before 1.19.2 contains a signature verification bypass in verifyImages because cached verification results are keyed by the image reference string (such as a tag) rather than bound to the verified digest, so cache hits skip signature and attestation checks. An attacker who can submit workloads and move a registry tag can warm the cache with a signed image, repoint the tag, and have Kyverno admit the workload and use mutateDigest to pin the unverified digest.

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:L

Source: CVE Program / CVE List V5

Vulnerability Type

检查时间与使用时间(TOCTOU)的竞争条件

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
kyverno	kyverno	1.18.0 ~ 1.19.2	-

II. Public POCs for CVE-2026-122321

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-122321

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Other References for CVE-2026-122321 (2)

https://github.com/kyverno/kyverno/security/advisories/GHSA-2r43-6962-xcw5 vendor-advisory
https://www.vulncheck.com/advisories/kyverno-1.18.0-before-1.19.2-verifyimages-cache-signature-verification-bypass third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-122321

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-2026-122311	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-2026-122308	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-367