Kyverno's Improper JMESPath Variable Evaluation Leads to Denial of Service

Kyverno is a policy engine designed for cloud native platform engineering teams. In versions 1.14.1 and below, a Denial of Service (DoS) vulnerability exists due to improper handling of JMESPath variable substitutions. Attackers with permissions to create or update Kyverno policies can craft expressions using the {{@}} variable combined with a pipe and an invalid JMESPath function (e.g., {{@ | non_existent_function }}). This leads to a nil value being substituted into the policy structure. Subsequent processing by internal functions, specifically getValueAsStringMap, which expect string values, results in a panic due to a type assertion failure (interface {} is nil, not string). This crashes Kyverno worker threads in the admission controller and causes continuous crashes of the reports controller pod. This is fixed in version 1.14.2.

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

输入验证不恰当

Kyverno 安全漏洞

Kyverno是Kyverno开源的一个为 Kubernetes 设计的策略引擎。 Kyverno 1.14.1及之前版本和2025.6.0-rc1至2025.6.3版本存在安全漏洞，该漏洞源于JMESPath变量处理不当，可能导致拒绝服务攻击。

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