-------- 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 <[email protected]>
Reply-To: [email protected]
To: [email protected]
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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