CVE-2026-40879EPSS p25.9%
CVE-2026-40879CVE-2026-40879
nestjs / nest
Description
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.
Scoring
| CVSS | 7.5 () |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| EPSS | 0.33% probability of exploitation · percentile 25.9% · 2026-10-27T12:03:15Z |
| Last modified | 2026-10-26 |