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Message-ID: <e053dfa9-848e-465e-bab0-a7553d512716@oracle.com>
Date: Mon, 13 Apr 2026 15:17:48 -0700
From: Alan Coopersmith <alan.coopersmith@...cle.com>
To: oss-security@...ts.openwall.com
Subject: [CVE-2026-4786] CPython: Incomplete mitigation of
CVE-2026-4519, %action expansion for command injection to webbrowser.open()
-------- 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 <seth@...hon.org>
Reply-To: security-sig@...hon.org
To: security-announce@...hon.org
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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