Vulnerability 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.
Related Weaknesses (CWE)
References
- https://github.com/python/cpython/commit/2bbcf3fb7a420a05605576c0f9468d4675381b5
- https://github.com/python/cpython/commit/5dadc64673ce875ebfb24163907777dae0f6ca0
- https://github.com/python/cpython/commit/7d95a1dc7382b55cba7fdd6a110336077584a4f
- https://github.com/python/cpython/commit/bb3446dda6c49b32e67c11dbbbf221b40be0076
- https://github.com/python/cpython/commit/c88704431ea3248ca769384c13856330976fac1
- https://github.com/python/cpython/commit/eac4fe3b2c77693790a5ef7dfab127c1fee81bf
- https://github.com/python/cpython/commit/ef12d0dc824baccf737bba1458e5eed3d1e0fce
- https://github.com/python/cpython/issues/87451
- https://github.com/python/cpython/pull/149648
- https://mail.python.org/archives/list/[email protected]/thread/ITF2BA
FAQ
What is CVE-2026-8328?
CVE-2026-8328 is a documented vulnerability. 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 (getpeer...
How severe is CVE-2026-8328?
CVSS scoring is not yet available for CVE-2026-8328. Check NVD for updates.
Is there a patch for CVE-2026-8328?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.