undici vulnerable to Denial of Service via unrequested WebSocket subprotocol

Impact The undici WebSocket client throws an uncaught TypeError during the opening handshake when a server's 101 response includes a Sec-WebSocket-Protocol header that the client never requested. The throw occurs in a queueMicrotask callback with no surrounding try/catch, so it propagates as an...

GHSA-RFGV-XXQX-MFG5 undici vulnerable to Denial of Service via unrequested WebSocket subprotocol

Impact The undici WebSocket client throws an uncaught TypeError during the opening handshake when a server's 101 response includes a Sec-WebSocket-Protocol header that the client never requested. The throw occurs in a queueMicrotask callback with no surrounding try/catch, so it propagates as an...

Important: nodejs22

Issue Overview: undici's WebSocket client crashes the whole Node.js process during the opening handshake when a server responds with a subprotocol that the client never requested. A default WebSocket connection sends no subprotocol, but if the server's 101 response includes a Sec-WebSocket-Protoc...

CVE-2026-19534: Uncaught Exception

undici's WebSocket client crashes the whole Node.js process during the opening handshake when a server responds with a subprotocol that the client never requested. A default WebSocket connection sends no subprotocol, but if the server's 101 response includes a Sec-WebSocket-Protocol header, undic...

PT-2026-76204

Summary A Deno program that opens a client WebSocket connection could be crashed by the remote server. While handling the WebSocket handshake response, Deno parsed the Sec-WebSocket-Protocol and Sec-WebSocket-Extensions response headers in a way that assumed their bytes were always printable ASCI...

PT-2026-50601

Name of the Vulnerable Software and Affected Versions Deno versions prior to 2.7.5 Description A Deno program opening a client WebSocket connection can be crashed by a remote server. During the WebSocket handshake response, Deno parsed the 'Sec-WebSocket-Protocol' and 'Sec-WebSocket-Extensions'...

CVE-2026-45541: NULL Pointer Dereference

ESF-IDF is the Espressif Internet of Things IOT Development Framework. In versions 5.2.6, 5.3.5, 5.4.4, 5.5.4, and 6.0, a NULL-pointer dereference exists in the WebSocket subprotocol-negotiation path of the esphttpserver component. While parsing the client-supplied Sec-WebSocket-Protocol request...

CVE-2026-42544

Granian is a Rust HTTP server for Python applications. From 1.2.0 to 2.7.4, Granian aborts a worker process when an unauthenticated client sends a WebSocket upgrade request whose Sec-WebSocket-Protocol header contains non-ASCII bytes. The crash happens in Granian's WebSocket scope construction...

CVE-2026-42544: Improper Input Validation

Granian is a Rust HTTP server for Python applications. From 1.2.0 to 2.7.4, Granian aborts a worker process when an unauthenticated client sends a WebSocket upgrade request whose Sec-WebSocket-Protocol header contains non-ASCII bytes. The crash happens in Granian's WebSocket scope construction...

EUVD-2021-0968

Malware in sbrugna...

Regular Expression Denial Of Service (ReDoS)

ws is vulnerable to regular expression denial of service. An attacker is able to cause excessive CPU consumption that can lead to an application crash by submitting a malicious value of Sec-Websocket-Protocol...

Regular Expression Denial of Service

Overview In ws before versions 5.2.3, 6.2.2 and 7.4.6 there is a ReDOS vulnerability. Impact A specially crafted value of the Sec-Websocket-Protocol header can be used to significantly slow down a ws server. Proof of concept js for const length of 1000, 2000, 4000, 8000, 16000, 32000 const value ...

CVE-2021-32640

A flaw was found in nodejs-ws. A specially crafted value of the Sec-Websocket-Protocol header can be used to significantly slow down a ws server. Mitigation In vulnerable versions of ws, the issue can be mitigated by reducing the maximum allowed length of the request headers using the...

Cross site request forgery (csrf)

ws is an open source WebSocket client and server library for Node.js. A specially crafted value of the Sec-Websocket-Protocol header can be used to significantly slow down a ws server. The vulnerability has been fixed in email protected...

CVE-2021-32640

ws is an open source WebSocket client and server library for Node.js. A specially crafted value of the Sec-Websocket-Protocol header can be used to significantly slow down a ws server. The vulnerability has been fixed in [email protected]...

CVE-2021-32640

ws is an open source WebSocket client and server library for Node.js. A specially crafted value of the "Sec-Websocket-Protocol" header can be used to significantly slow down a ws server. The vulnerability has been fixed in [email protected]...

CVE-2021-32640: Uncontrolled Resource Consumption

ws is an open source WebSocket client and server library for Node.js. A specially crafted value of the Sec-Websocket-Protocol header can be used to significantly slow down a ws server. The vulnerability has been fixed in [email protected]...

PT-2021-4265

Name of the Vulnerable Software and Affected Versions ws versions prior to 7.4.6 ws versions prior to 6.2.2 ws versions prior to 5.2.3 Description A specially crafted value of the Sec-Websocket-Protocol header can be used to significantly slow down a ws server, potentially leading to a denial of...