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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.

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.

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.

Impact: The undici WebSocket client enforces maxPayloadSize on the cum ...

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

Important: nodejs:22 security, bug fix, and enhancement update

Important: nodejs:22 security, bug fix, and enhancement update

Important: nodejs22 security, bug fix, and enhancement update

ELSA-2026-41947: nodejs:22 security, bug fix, and enhancement update (IMPORTANT)

ELSA-2026-35892: nodejs:22 security, bug fix, and enhancement update (IMPORTANT)

ELSA-2026-35842: nodejs22 security, bug fix, and enhancement update (IMPORTANT)

Important: nodejs:24 security, bug fix, and enhancement update

Important: nodejs:24 security, bug fix, and enhancement update

Important: nodejs24 security, bug fix, and enhancement update

ELSA-2026-39868: nodejs:24 security, bug fix, and enhancement update (IMPORTANT)

ELSA-2026-35891: nodejs:24 security, bug fix, and enhancement update (IMPORTANT)

ELSA-2026-35841: nodejs24 security, bug fix, and enhancement update (IMPORTANT)

Security update for nodejs22

Security update for nodejs22

Security update for nodejs24