undici WebSocket client vulnerable to denial of service via fragment count bypass

高 7.5CVE-2026-12151 · GHSA-vxpw-j846-p89q · 17/06/2026 公開 · 11/09/2026 更新

パッケージ	影響を受けるバージョン	修正済みバージョン
undici nodejs	`≥ 6.17.0, < 6.27.0≥ 7.0.0, < 7.28.0≥ 8.0.0, < 8.5.0`	`6.27.07.28.08.5.0`
undici npm	`≥ 7.0.0, < 7.28.0≥ 8.0.0, < 8.5.0< 6.27.0`	`7.28.08.5.06.27.0`

概要

Impact

The undici WebSocket client enforces maxPayloadSize on the cumulative byte count of fragments in a message but does not enforce a limit on the number of fragments. A malicious WebSocket server can stream many small or empty continuation frames that each pass per-frame and cumulative-size validation, collectively causing unbounded memory growth in the client process. The result is memory exhaustion and a denial of service.

Affected applications are those using the undici WebSocket client (new WebSocket(...)) or the WebSocketStream API that can be induced to connect to an attacker-controlled or compromised WebSocket endpoint.

All releases starting at undici 6.17.0 are affected.

Patches

Upgrade to undici v6.27.0, v7.28.0 or v8.5.0.

Workarounds

No workaround is available. The fix must be applied through an upgrade.

NVD の説明

Impact: The undici WebSocket client enforces maxPayloadSize on the cumulative byte count of fragments in a message but does not enforce a limit on the number of fragments. A malicious WebSocket server can stream many small or empty continuation frames that each pass per-frame and cumulative-size validation, collectively causing unbounded memory growth in the client process. The result is memory exhaustion and a denial of service. Affected applications are those using the undici WebSocket client (new WebSocket(...)) or the WebSocketStream API that can be induced to connect to an attacker-controlled or compromised WebSocket endpoint. All releases starting at undici 6.17.0 are affected. Patches: Upgrade to undici >= 6.26.0, >= 7.28.0, or >= 8.5.0. Workarounds: No workaround is available. The fix must be applied through an upgrade.