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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(). This patch is related to CVE-2021-4189.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade python3 | Aug 17, 2026 | May 13, 2026 |
| Debian | — | Upgrade python3.11Upgrade python3.13 | Jul 23, 2026 | May 13, 2026 |
| Ubuntu | — | Upgrade python3.14Upgrade python3.10Upgrade libpython3.10Upgrade python3.12Upgrade libpython3.12t64Upgrade libpython3.14 | Jul 6, 2026 | May 13, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 22, 2026 | May 13, 2026 |
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