-------- Forwarded Message --------
Subject: [Security-announce][CVE-2026-4519] webbrowser.open() API allows
leading dashes
Date: Fri, 20 Mar 2026 15:03:34 +0000
From: Seth Larson <[email protected]>
Reply-To: [email protected]
To: [email protected]
There is a MEDIUM severity vulnerability affecting CPython.
The webbrowser.open() API would accept leading dashes in the URL which could be
handled as command line options for certain web browsers. New behavior rejects
leading dashes. Users are recommended to sanitize URLs prior to passing to
webbrowser.open().
Please see the linked CVE ID for the latest information on affected versions:
* https://www.cve.org/CVERecord?id=CVE-2026-4519
* https://github.com/python/cpython/pull/143931
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