Improper Validation of Specified Type of Input Affecting fastify package, versions >=5.0.0 <5.3.2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-JS-FASTIFY-9788069
- published20 Apr 2025
- disclosed18 Apr 2025
- creditUnknown
Introduced: 18 Apr 2025
NewCVE-2025-32442 (opens in a new tab)How to fix?
Upgrade fastify to version 5.3.2 or higher.
Overview
fastify is an overhead web framework, for Node.js.
Affected versions of this package are vulnerable to Improper Validation of Specified Type of Input in the validate() function, which does not sufficiently validate the content of messages with content-type-specifying headers. An attacker can bypass validation by providing a malformed content-type, such as by altering letter casing or adding whitespace before a semicolon. This is only exploitable if specific content types are defined in the schema for validation purposes, like in the content element of the structure below.
fastify.post('/', {
handler(request, reply) {
reply.code(200).send(request.body)
},
schema: {
body: {
content: {
'application/json': {
schema: {
type: 'object',
properties: {
'foo': {
type: 'string',
}
},
required: ['foo']
}
},
}
}
}
})