Bug 2477300 (CVE-2026-8328)

Summary: CVE-2026-8328 python: Python: FTP connection redirection via ftpcp() function bypass
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
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Priority: high    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in the `ftplib.py` module of Python. This vulnerability allows a remote attacker to bypass a previous security fix by manipulating the `ftpcp()` function. By supplying a malicious IP address and port, an attacker can redirect FTP connections to an arbitrary host. This could lead to the compromise of data integrity or other network-based attacks.
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Description OSIDB Bzimport 2026-05-13 21:01:43 UTC 
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.