fastify vulnerable to request validation bypass via skipped boolean false schemas

[ Description ]Official description

fastify versions before 5.12.2 decide whether to compile a request schema based on JavaScript truthiness, but JSON Schema Draft 7 defines the boolean false as a valid schema that rejects every instance. When an application assigns false to a route's body, querystring, params, or headers schema to deny all input, fastify treats it as a missing schema, compiles no validator, and runs the route handler on any request. An unauthenticated remote client can therefore reach a handler that a valid deny-all schema was intended to make unreachable, a complete validation bypass that can lead to unauthorized state changes or execution of disabled operations. Users should upgrade to fastify 5.12.2 or later.

[ Fixes ]Fixes and patches

• fastify 5.12.2Fixed version · GitHub Advisories · npm package fastify: upgrade to 5.12.2 or later (affected < 5.12.2)

[ Packages ]Affected open-source packages

• fastify npmAffected < 5.12.2 · fixed in 5.12.2 · GHSA-hwr6-493r-vm6h

[ References ]References

• github.com/fastify/fastify/security/advisories/GHSA-hwr6-493r-vm6h
• cna.openjsf.org/security-advisories.html