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.
Published: 2026-10-06
Score: 5.3 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

Vendor Solution

Upgrade to Punk 0.55 or later.

Tracking

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Advisories

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History

Tue, 06 Oct 2026 21:15:00 +0000

Type Values Removed Values Added
First Time appeared Perl
Perl punk
Vendors & Products Perl
Perl punk

Tue, 06 Oct 2026 14:30:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 06 Oct 2026 05:30:00 +0000

Type Values Removed Values Added
References

Tue, 06 Oct 2026 01:30:00 +0000

Type Values Removed Values Added
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.
Title 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
Weaknesses CWE-1385
References

cve-icon MITRE

Status: PUBLISHED

Assigner: CPANSec

Published:

Updated: 2026-10-06T13:14:39.875Z

Reserved: 2026-10-01T22:29:10.271Z

Link: CVE-2026-104380

cve-icon Vulnrichment

Updated: 2026-10-06T05:07:59.987Z

cve-icon NVD

Status : Deferred

Published: 2026-10-06T02:17:03.910

Modified: 2026-10-06T15:03:59.427

Link: CVE-2026-104380

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-06T20:56:02Z

Weaknesses