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CVE-2026-104380 CPAN Security Group
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CVE ID: CVE-2026-104380
Distribution: Punk
Versions: from 0.48 before 0.55
MetaCPAN: https://metacpan.org/dist/Punk
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
Description
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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.
Problem types
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- CWE-1385 Missing Origin Validation in WebSockets
Solutions
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Upgrade to Punk 0.55 or later.
References
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https://metacpan.org/release/LNATION/Punk-0.55/diff/LNATION/Punk-0.54
https://metacpan.org/release/LNATION/Punk-0.55/changes
