Fastify is a fast and low overhead web framework, for Node.js. Prior to version 5.7.2, a validation bypass vulnerability exists in Fastify where request body validation schemas specified by Content-Type can be completely circumvented. By appending a tab character (\t) followed by arbitrary content to the Content-Type header, attackers can bypass body validation while the server still processes the body as the original content type.
This issue has been patched in version 5.7.2.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
High
Complete data modification
Availability
None
No disruption
CVSS Vector v3.1
Weakness Type (CWE)
References 6
https://fastify.dev/docs/latest/Reference/Validation-and-Serialization
security-advisories@github.com
https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba752134…
security-advisories@github.com
https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba752134…
security-advisories@github.com
https://github.com/fastify/fastify/commit/32d7b6add39ddf082d92579a58bea7018c5ac…
security-advisories@github.com
https://github.com/fastify/fastify/security/advisories/GHSA-jx2c-rxcm-jvmq
security-advisories@github.com
https://hackerone.com/reports/3464114
security-advisories@github.com