Description
Fastify is a web framework with minimal overhead and plugin architecture. The attacker can use the incorrect `Content-Type` to bypass the `Pre-Flight` checking of `fetch`. `fetch()` requests with Content-Type’s essence as "application/x-www-form-urlencoded", "multipart/form-data", or "text/plain", could potentially be used to invoke routes that only accepts `application/json` content type, thus bypassing any CORS protection, and therefore they could lead to a Cross-Site Request Forgery attack. This issue has been patched in version 4.10.2 and 3.29.4. As a workaround, implement Cross-Site Request Forgery protection using `@fastify/csrf'.
References (3)
Core 3
Core References
Various Sources
https://www.npmjs.com/package/%40fastify/csrf
Patch, Third Party Advisory
https://github.com/fastify/fastify/commit/62dde76f1f7aca76e38625fe8d983761f26e6fc9
Third Party Advisory
https://github.com/fastify/fastify/security/advisories/GHSA-3fjj-p79j-c9hh
Scores
CVSS v3
4.2
EPSS
0.0017
EPSS Percentile
38.2%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-352
Status
published
Products (2)
fastify/fastify
3.0.0 - 3.29.4
npm/fastify
4.0.0 - 4.10.2npm
Published
Nov 22, 2022
Tracked Since
Feb 18, 2026