CVE-2026-40879
HIGH
NVD
CVSS Score
7.5
Severity
HIGH
Published
Apr 21, 2026
Vendor
unknown
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.