Medium
FTP PASV SSRF, ftpcp() does not use actual peer address, trusts server-supplied PASV host address
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-8328
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 13:18 UTC · Revision 1
Source evidence
FTP PASV SSRF, ftpcp() does not use actual peer address, trusts server-supplied PASV host address
core-osv · Original sourcePublished 13 May 2026, 20:14 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.
osv:CVE-2026-8328
Complete source record
{
"id": "11ec77a2305b6d05eab7cf1733f6c4592ba22ee5b73be260e864a7882e69d3b4",
"url": "https://osv.dev/vulnerability/CVE-2026-8328",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "FTP PASV SSRF, ftpcp() does not use actual peer address, trusts server-supplied PASV host address",
"summary": "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.",
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"BIT-python-2026-8328",
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"CVE-2026-8328",
"PSF-0000-CVE-2026-8328",
"PSF-2026-24"
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"type": "CVSS_V4",
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"modified": "2026-10-28T02:30:29.195390396Z",
"provider": "osv",
"references": [
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"https://mail.python.org/archives/list/security-announce@python.org/thread/ITF2BAPBQEPYK3LDMPRSY435JGNHYNDP/",
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