CVE-2026-104380

Punk versions from 0.48 before 0.55 for Perl route Extended CONNECT requests to any GET route without an Origin check in ps_serve_one. On HTTP/2 and HTTP/3 a WebSocket handshake arrives as an Extended CONNECT, which is matched as a GET and so reaches every GET route, API operation and mount. The Origin check runs only when a websocket route matches. On this transport the handler's status is the handshake response, and a 2xx accepts it. A cross-origin page can open a WebSocket to any path and learn from its open or error event whether that path returns 2xx.

• https://metacpan.org/release/LNATION/Punk-0.55/changes
• https://metacpan.org/release/LNATION/Punk-0.55/diff/LNATION/Punk-0.54
• http://www.openwall.com/lists/oss-security/2026/10/06/1