undici WebSocket client vulnerable to Denial of Service via unbounded automatic PONG buffering

影響: npm:undici >= 5.15.0, < 6.29.1 → 6.29.1, npm:undici >= 7.0.0, < 7.30.1 → 7.30.1, npm:undici >= 8.0.0, < 8.12.2 → 8.12.2

undici's WebSocket client (including Node.js's bundled globalThis.WebSocket) can be driven to exhaust process memory by a malicious or compromised WebSocket server. For every PING frame received, the receiver automatically writes a PONG response to the socket and ignores the false return value from socket.write(), which is a backpressure signal, so a server that streams small PING frames while never reading the client's PONGs makes the outbound write queue and heap grow without bound until the…

在 GitHub Advisory Database 阅读

2026/10/28 04:02，GitHub Advisory Database 发布了“undici WebSocket client vulnerable to Denial of Service via unbounded automatic PONG buffering”（类型：漏洞公告）。严重程度为“中危”（medium）。相关技术：JavaScript / Node.js。CVE：CVE-2026-109932。