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Message-ID: <a282ed88-5745-477b-ab63-7fb360cd6ae7@oracle.com>
Date: Wed, 13 May 2026 17:05:42 -0700
From: Alan Coopersmith <alan.coopersmith@...cle.com>
To: oss-security@...ts.openwall.com
Subject: [CVE-2026-8328] CPython: FTP PASV SSRF, ftpcp() does
not use actual peer address, trusts server-supplied PASV host address
-------- Forwarded Message --------
Subject: [Security-announce][CVE-2026-8328] FTP PASV SSRF, ftpcp() does not use
actual peer address, trusts server-supplied PASV host address
Date: Wed, 13 May 2026 20:15:52 +0000
From: Seth Larson <seth@...hon.org>
Reply-To: security-sig@...hon.org
To: security-announce@...hon.org
There is a MEDIUM severity vulnerability affecting CPython.
The ftpcp() function in Lib/ftplib.py was not updated when CVE-2021-4189 was
fixed. While makepasv() was patched to replace server-supplied PASV host
addresses with the actual peer address (getpeername()[0]), ftpcp() still calls
parse227() directly and passes the raw attacker-controllable IP address and port
to target.sendport().
Please see the linked CVE ID for the latest information on affected versions:
* https://www.cve.org/CVERecord?id=CVE-2026-8328
* https://github.com/python/cpython/pull/149648
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