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CVE-2025-32442— Fastify vulnerable to invalid content-type parsing, which could lead to validation bypass

Quick assessment

Affected
fastify fastify
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Fastify是Fastify开源的一个 Web 框架。 Fastify 5.0.0版本至5.3.0版本存在安全漏洞，该漏洞源于内容类型验证可能被绕过。

CVSS 7.5 · High EPSS 0.72% · P52

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-32442

Vulnerability Information
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Vulnerability Title
Fastify vulnerable to invalid content-type parsing, which could lead to validation bypass
Source: CVE Program / CVE List V5
Vulnerability Description
Fastify is a fast and low overhead web framework, for Node.js. In versions 5.0.0 to 5.3.0 as well as version 4.29.0, applications that specify different validation strategies for different content types have a possibility to bypass validation by providing a _slightly altered_ content type such as with different casing or altered whitespacing before `;`. This was patched in v5.3.1, but the initial patch did not cover all problems. This has been fully patched in v5.3.2 and v4.29.1. A workaround involves not specifying individual content types in the schema.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1287
Source: CVE Program / CVE List V5
Vulnerability Title
Fastify 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Fastify是Fastify开源的一个 Web 框架。 Fastify 5.0.0版本至5.3.0版本存在安全漏洞，该漏洞源于内容类型验证可能被绕过。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
fastify fastify >= 5.0.0, < 5.3.2 -

II. Public POCs for CVE-2025-32442

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 6627 chars
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III. Intelligence Information for CVE-2025-32442

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Patches & Fixes for CVE-2025-32442 (2)

Vendor Advisories for CVE-2025-32442 (1)

IV. Related Vulnerabilities

Same product: fastify
Same vendor: fastify
Same weakness: CWE-1287

V. Comments for CVE-2025-32442

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