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CVE-2026-100704— Kyverno before 1.19.1 ImageValidatingPolicy Exception 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 是 Kubernetes 的策略引擎。在 1.14.0 到 1.19.0 版本中，ImageValidatingPolicy（policies.kyverno.io/v1beta1）评估器不会读取 PolicyException 的 spec.images 和 spec.allowedValues 字段。任何其 policyRefs 和 matchConditions 与某个资源匹配的 PolicyException 都会导致整个资源跳过镜像签名验证，而不是仅对列出的镜像或值跳过。因此，本意是豁免单

CVSS 7.7 · High EPSS 0.18% · P7
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I. Basic Information for CVE-2026-100704

Vulnerability Information
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Vulnerability Title
Kyverno before 1.19.1 ImageValidatingPolicy Exception Bypass
Source: CVE Program / CVE List V5
Vulnerability Description
Kyverno is a policy engine for Kubernetes. In versions 1.14.0 through 1.19.0, the ImageValidatingPolicy (policies.kyverno.io/v1beta1) evaluator never reads the spec.images and spec.allowedValues fields of a PolicyException. Any PolicyException whose policyRefs and matchConditions match a resource causes image signature verification to be skipped for the entire resource rather than only for the listed images or values, so an exception intended to exempt a single trusted image exempts every image on the matched resource(s). As a result, unsigned or untrusted images can be admitted to the cluster without signature verification. This differs from ValidatingPolicy, GeneratingPolicy, and MutatingPolicy, which treat the same field as a partial exemption. The issue is fixed in version 1.19.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
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 1.14.0 ~ 1.19.1 -

II. Public POCs for CVE-2026-100704

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III. Intelligence Information for CVE-2026-100704

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Vendor Advisories for CVE-2026-100704 (1)

Other References for CVE-2026-100704 (1)

Same Patch Batch · kyverno · 2026-09-26 · 5 CVEs total

CVE-2026-100706 9.9 CRITICAL kyverno before 1.19.1 Privilege Escalation via Policy apiCall urlPath
CVE-2026-100707 7.7 HIGH Kyverno before 1.19.1 Namespace Isolation Bypass via Percent-Encoded Path
CVE-2026-100703 7.7 HIGH Kyverno before 1.19.1 Cross-Namespace Data Access via globalcontext.Lib
CVE-2026-100705 7.6 HIGH Kyverno before 1.19.1 SSRF via legacy apiCall service executor

IV. Related Vulnerabilities

Same product: kyverno
Same vendor: kyverno
Same weakness: CWE-863

V. Comments for CVE-2026-100704

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