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Node.js HTTP/2 Memory Leak Vulnerability via WINDOW_UPDATE Frames on Stream 0

Vulnerability

A memory leak vulnerability has been identified in Node.js HTTP/2 servers in versions 20.x, 22.x, 24.x, and 25.x. The issue arises when a client sends WINDOW_UPDATE frames on stream 0, causing the flow control window to exceed the maximum limit. While the server responds appropriately by sending a GOAWAY frame, the Http2Session object is not properly cleaned up, leading to resource exhaustion.

Impact

Exploitation of this vulnerability causes a memory leak that can lead to resource exhaustion on the server.

Remediation

Users can upgrade to Node.js versions 20.20.2, 22.22.2, 24.14.1, or 25.8.2 to address this vulnerability.

Added: Mar 30, 2026, 8:37 PM
Updated: Mar 30, 2026, 8:37 PM

Vulnerability Rating

Custom Algorithm
spread
7.8
impact
2.5
exploitability
4.3
remediation
7.7
relevance
4.9
threat
0.0
urgency
2.9
incentive
0.0

Our algorithm analyzes dozens of metrics to generate these 8 key vulnerability categories, which are then combined to calculate the overall risk score.