Missing release of memory after effective lifetime in Node.js - CVE-2026-21714
Published: March 25, 2026
Vulnerability identifier: #VU124546
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-21714
CWE-ID: CWE-401
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Node.js Foundation
Affected software:
Node.js
Node.js
Detailed vulnerability description
The vulnerability allows a remote attacker to cause resource exhaustion.
The vulnerability exists due to a memory leak in the HTTP/2 server implementation when processing WINDOW_UPDATE frames on stream 0. A remote attacker can send WINDOW_UPDATE frames that exceed the maximum flow control window, causing the Http2Session object to remain allocated despite sending a GOAWAY frame.
The server fails to clean up the Http2Session object after connection termination, leading to unbounded memory consumption.
How to mitigate CVE-2026-21714
Install security update from vendor's website.