CVE-2026-40879

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.

PUBLISHED Reserved 2026-04-15 | Published 2026-04-21 | Updated 2026-04-21 | Assigner GitHub_M

Problem types

CWE-674: Uncontrolled Recursion

Product status

References

github.com/...s/nest/security/advisories/GHSA-hpwf-8g29-85qm

cve.org (CVE-2026-40879)

nvd.nist.gov (CVE-2026-40879)

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