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5.9 Medium

CVE-2026-8328 The ftpcp() function in Lib/ftplib.py was not updated when CVE-2021-4189 was fixed

Description

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.

Affected products and versions

Product Affected versions Fixed in
CPython 3.15 3.15.0a1 → < 3.15.0b2 3.15.0b2
CPython 3.14 3.14.0 → < 3.14.6 3.14.6
CPython 3.13 3.13.0 → < 3.13.14 3.13.14
CPython 3.12 3.12.0 → < 3.12.14 3.12.14
CPython 3.11 3.11.0 → < 3.11.16 3.11.16
CPython 3.10 earliest → < 3.10.21 3.10.21

References

Timeline

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