Report: CVE-2026-40879 - Nest: DoS via Recursive handleData in JsonSocket (TCP Transport) - Expert Insights

Report: CVE-2026-40879 - Nest: DoS via Recursive handleData in JsonSocket (TCP Transport) - Expert Insights

CVE ID :CVE-2026-40879 Published : April 21, 2026, 8:17 p.m. | 28 minutes ago 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. Severity: 7.5 | HIGH Visit the link for more details, such as CVSS details, affected products, timeline, and more...

CVE Details

Severity
HIGH
Published
April 21, 2026
Affected Product: Node.js