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CVE-2026-100707— Kyverno before 1.19.1 Namespace Isolation Bypass via Percent-Encoded Path

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.

在 Kyverno 1.19.1 版本之前，namespaced Policy（命名空间作用域策略）资源中的 apiCall 上下文入口存在命名空间隔离绕过漏洞。该漏洞源于验证阶段与执行阶段对路径解释的不一致。低权限租户可以利用 urlPath 中的百分号编码的点段（dot-segments）来绕过命名空间检查，并通过 Kyverno 准入控制器的 ServiceAccount 凭证，读取其他命名空间中的资源。

CVSS 7.7 · High EPSS 0.46% · P37
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I. Basic Information for CVE-2026-100707

Vulnerability Information
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Vulnerability Title
Kyverno before 1.19.1 Namespace Isolation Bypass via Percent-Encoded Path
Source: CVE Program / CVE List V5
Vulnerability Description
Kyverno before 1.19.1 contains a namespace isolation bypass in the apiCall context entry of namespaced Policy resources due to inconsistent path interpretation between validation and execution. A low-privilege tenant can use percent-encoded dot-segments in urlPath to bypass namespace checks and read resources from other namespaces using the Kyverno admission controller's ServiceAccount credentials.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
kyverno kyverno 0 ~ 1.19.1 -

II. Public POCs for CVE-2026-100707

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III. Intelligence Information for CVE-2026-100707

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Vendor Advisories for CVE-2026-100707 (1)

Other References for CVE-2026-100707 (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-2026-100704 7.7 HIGH Kyverno before 1.19.1 ImageValidatingPolicy Exception Bypass
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-22

V. Comments for CVE-2026-100707

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