PSF-0000-CVE-2026-8328

vendorUSosv

view advisory published 2026-05-13Licence: per source

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.

describes (1)

Related CVEs.

ID	severity	EPSS	exploitable	published
CVE-2026-8328US	—	0.46% (39th)	—	2026-05-13
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 pe…

references

External citations — patches, advisories, analysis.

https://github.com/python/cpython/issues/87451REPORT
https://github.com/python/cpython/pull/149648WEB
https://mail.python.org/archives/list/security-announce@python.org/thread/ITF2BAPBQEPYK3LDMPRSY435JGNHYNDP/ADVISORY

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