CVE-2026-18504 Detail
Received
This CVE record has recently been published to the CVE List and has been included within the NVD dataset. Descriptionfastify is a fast and low overhead web framework for Node.js. Versions of fastify before 5.12.1 are affected by a schema validation bypass when a request body schema targets a root primitive value. When the schema validates a top-level primitive such as an integer, Ajv can coerce a JSON string into the expected type during validation, but Fastify does not replace the root request body with the coerced value, so the route handler receives the original unvalidated string. As a result, a request that should have failed validation can reach application logic with a value that does not satisfy the schema, which can undermine integrity and access-control checks that rely on the validated type. Users should upgrade to fastify 5.12.1, which fixes the mismatch. No known workarounds are available. Metrics
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Weakness Enumeration
Quick InfoCVE Dictionary Entry:CVE-2026-18504 NVD Published Date: 08/18/2026 NVD Last Modified: 08/18/2026 Source: openjs |
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