CVE-2026-104380

Medium

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.

SeverityMedium

CVSS5.3

Exploit probability—

ProductPunk

PublishedOct 6, 2026

First seenOct 6, 2026

Weakness typeCWE-1385CWE-1385

How to fix

Update

Punk0.55 or later

Patches

metacpan.org/release/LNATION/Punk-0.55/diff/LNATION/Punk-0.54

Vendor advisories

metacpan.org/release/LNATION/Punk-0.55/changes

Affected products

Product	Affected versions	Fixed in
Punk	0.48 ≤ v < 0.55	0.55

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