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EUVD-2026-292278

fkie_cve-2026-40879

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. A ~47 KB payload is sufficient to trigger RangeError. This vulnerability is fixed in 11.1.19.

GHSA-hpwf-8g29-85qm — Nest Affected by DoS via Recursive handleData in JsonSocket (TCP Transport)

Affected: npm: @nestjs/microservices

### 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/microservices@11.1.19`

### References

Discovered by https://github.com/hwpark6804-gif