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Message-ID: <e3c9469815721aa1bac6b22b93de6636@cpansec.org>
Date: Mon, 05 Oct 2026 22:14:49 -0300
From: Timothy Legge <timlegge@...nsec.org>
To: Cve Announce <cve-announce@...urity.metacpan.org>, Oss Security
<oss-security@...ts.openwall.com>
Subject: 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
========================================================================
CVE-2026-104380 CPAN Security Group
========================================================================
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
-----------
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
-------------
- CWE-1385 Missing Origin Validation in WebSockets
Solutions
---------
Upgrade to Punk 0.55 or later.
References
----------
https://metacpan.org/release/LNATION/Punk-0.55/diff/LNATION/Punk-0.54
https://metacpan.org/release/LNATION/Punk-0.55/changes
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