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

- 種別: advisory
- 重大度: medium
- 関連技術: nodejs
- CVE: CVE-2026-109932
- 公開日時: 2026-10-27T19:02:15.000Z
- 情報源: GitHub Advisory Database (https://github.com/advisories/GHSA-9fm3-97px-rjf6)
- パーマリンク: https://vulnpulse.app/items/ghsa-ghsa-9fm3-97px-rjf6

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…