CVE-2024-27983: Node.js Node

High severity, CVSS 8.2. EPSS: 87.2% chance of exploitation in the next 30 days.

An attacker can make the Node.js HTTP/2 server completely unavailable by sending a small amount of HTTP/2 frames packets with a few HTTP/2 frames inside. It is possible to leave some data in nghttp2 memory after reset when headers with HTTP/2 CONTINUATION frame are sent to the server and then a TCP connection is abruptly closed by the client triggering the Http2Session destructor while header frames are still being processed (and stored in memory) causing a race condition.

Affected products

• Node.js Node: from 4.0, before 5 (fixed in 5); from 5.0, before 6 (fixed in 6); from 6.0, before 7 (fixed in 7); from 7.0, before 8 (fixed in 8); from 8.0, before 9 (fixed in 9); from 9.0, before 10 (fixed in 10); …
• Node.js Node.js: up to and including 18.20.0; up to and including 20.12.0; up to and including 21.7.1

Published 2024-04-09. Last modified 2026-06-17.