CVE-2025-47281
Kyverno's Improper JMESPath Variable Evaluation Leads to Denial of Service
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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.
Reserved 2025-05-05 | Published 2025-07-23 | Updated 2025-07-23 | Assigner GitHub_MCWE-20: Improper Input Validation
github.com/...yverno/security/advisories/GHSA-r5p3-955p-5ggq
github.com/...ommit/cbd7d4ca24de1c55396fc3295e9fc3215832be7c
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