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.
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Tue, 05 Aug 2025 16:00:00 +0000
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CPEs | cpe:2.3:a:kyverno:kyverno:*:*:*:*:*:*:*:* |
Thu, 24 Jul 2025 21:30:00 +0000
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First Time appeared |
Kyverno
Kyverno kyverno |
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Vendors & Products |
Kyverno
Kyverno kyverno |
Wed, 23 Jul 2025 21:15:00 +0000
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ssvc
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Wed, 23 Jul 2025 20:45:00 +0000
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Description | 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. | |
Title | Kyverno's Improper JMESPath Variable Evaluation Leads to Denial of Service | |
Weaknesses | CWE-20 CWE-248 |
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Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2025-07-23T20:49:31.882Z
Reserved: 2025-05-05T16:53:10.373Z
Link: CVE-2025-47281

Updated: 2025-07-23T20:49:28.741Z

Status : Analyzed
Published: 2025-07-23T21:15:26.397
Modified: 2025-08-05T15:51:19.533
Link: CVE-2025-47281

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