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/microservices@11.1.19` ### References Discovered by https://github.com/hwpark6804-gif
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-40879US | — | — | ||
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()… | ||||
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references
External citations — patches, advisories, analysis.
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