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CVE-2025-32442
JavaScript vulnerability analysis and mitigation

Overview

Fastify, a fast and low overhead web framework for Node.js, disclosed a vulnerability (CVE-2025-32442) affecting versions 5.0.0 to 5.3.0. The vulnerability allows applications that specify different validation strategies for different content types to bypass validation by providing a slightly altered content type, such as with different casing or altered whitespacing before ';'. This security issue was initially patched in v5.3.1, but due to incomplete fixes, a full patch was later released in v5.3.2 (GitHub Advisory).

Technical details

The vulnerability stems from improper content-type parsing in the validation mechanism. When applications use content-type specific schema validation, attackers could bypass the validation controls by manipulating the content-type header through case modifications or whitespace alterations. The issue has been assigned a CVSS v3.1 base score of 7.5 (HIGH) with a vector string of CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N, indicating network accessibility, low attack complexity, and no required privileges or user interaction (GitHub Advisory, NVD).

Impact

The vulnerability primarily affects data integrity, as indicated by the CVSS metrics showing high impact on integrity but no impact on confidentiality or availability. Applications using content-type specific validation schemas could be exposed to malicious data that would normally be rejected by the validation rules, potentially leading to unexpected application behavior or security issues (GitHub Advisory).

Mitigation and workarounds

A complete fix has been released in Fastify version 5.3.2. For users unable to update immediately, a workaround involves not specifying individual content types in the schema. Instead of using content-type specific validation, users should implement a single schema validation approach (GitHub Advisory, NVD).

Additional resources


SourceThis report was generated using AI

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