CyberRota Analysis
AI-GeneratedVersions of Fastify prior to 5.12.1 are vulnerable to a schema validation bypass that allows unvalidated request bodies to reach application logic, potentially undermining data integrity and access control. This issue arises when a request body schema targets a root primitive value, leading to the original unvalidated string being processed instead of the expected type. Developers using Fastify should prioritize upgrading to version 5.12.1 to mitigate this risk, as no workarounds are available.
Public Exploit Signal
A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.
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Original NVD Description
fastify 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.
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