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CVE-2026-8328— FTP PASV SSRF, ftpcp() does not use actual peer address, trusts server-supplied PASV host address

Quick assessment

Affected
Python Software Foundation CPython
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

CPython是Python基金会的一个用C语言实现的Python解释器。 CPython存在代码问题漏洞，该漏洞源于Lib/ftplib.py中的ftpcp()函数，可能导致攻击者控制IP地址和端口。

CVSS 5.9 · Medium EPSS 0.68% · P51

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 6

VendorProduct Version RangeStatus
Python Software Foundation CPython < 3.10.21 affected
3.11.0< 3.11.16 affected
3.12.0< 3.12.14 affected
3.13.0< 3.13.14 affected
3.14.0< 3.14.6 affected
3.15.0a1< 3.15.0b2 affected
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I. Basic Information for CVE-2026-8328

Vulnerability Information
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Vulnerability Title
FTP PASV SSRF, ftpcp() does not use actual peer address, trusts server-supplied PASV host address
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
CPython 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CPython是Python基金会的一个用C语言实现的Python解释器。 CPython存在代码问题漏洞，该漏洞源于Lib/ftplib.py中的ftpcp()函数，可能导致攻击者控制IP地址和端口。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Python Software Foundation CPython 0 ~ 3.10.21 -

II. Public POCs for CVE-2026-8328

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III. Intelligence Information for CVE-2026-8328

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Patches & Fixes for CVE-2026-8328 (8)

Vendor Advisories for CVE-2026-8328 (2)

IV. Related Vulnerabilities

Same product: CPython
Same vendor: Python Software Foundation
Same weakness: CWE-918

V. Comments for CVE-2026-8328

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