CVE-2026-40879 Nest: DoS via Recursive handleData in JsonSocket (TCP Transport)

Nest is a framework for building scalable Node.js server-side applications. Prior to 11.1.19, when an attacker sends many small, valid JSON messages in one TCP frame, handleData recurses once per message; the buffer shrinks each call. maxBufferSize is never reached; call stack overflows instead. ...

Nest Affected by DoS via Recursive handleData in JsonSocket (TCP Transport)

Impact Attacker sends many small, valid JSON messages in one TCP frame → handleData recurses once per message; buffer shrinks each call → maxBufferSize is never reached; call stack overflows instead → A 47 KB payload is sufficient to trigger RangeError Patches Fixed in @nestjs/[email protected]....

Uncontrolled Recursion

Overview @nestjs/microservices is a Nest - modern, fast, powerful node.js web framework @microservices Affected versions of this package are vulnerable to Uncontrolled Recursion through the handleData function in packages/microservices/helpers/json-socket.ts. An attacker can crash the TCP...