-------- Forwarded Message --------
Subject: [Security-announce][CVE-2026-4786] Incomplete mitigation of
CVE-2026-4519, %action expansion for command injection to webbrowser.open()
Date: Mon, 13 Apr 2026 21:53:53 +0000
From: Seth Larson <[email protected]>
Reply-To: [email protected]
To: [email protected]
There is a HIGH severity vulnerability affecting CPython.
Mitgation of CVE-2026-4519 was incomplete. If the URL contained "%action" the
mitigation could be bypassed for certain browser types the "webbrowser.open()"
API could have commands injected into the underlying shell. See CVE-2026-4519
for details.
Please see the linked CVE ID for the latest information on affected versions:
* https://www.cve.org/CVERecord?id=CVE-2026-4786
* https://github.com/python/cpython/pull/148170
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