Medium severity · published May 13, 2026
CVE-2026-8328
FTP PASV SSRF, ftpcp() does not use actual peer address, trusts server-supplied PASV host address
5.9
CVSS
0.5%
EPSS
No
On KEV
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.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 40% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CP
CPython · Python Software Foundation
before 3.10.21; 3.11.0 before 3.11.16; 3.12.0 before 3.12.14; 3.13.0 before 3.13.14; 3.14.0 before 3.14.6; 3.15.0a1 before 3.15.0b2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-8328
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-8328
github.com
https://github.com/python/cpython/commit/2bbcf3fb7a420a05605576c0f9468d4675381b5f
github.com
https://github.com/python/cpython/commit/5dadc64673ce875ebfb24163907777dae0f6ca06
github.com
https://github.com/python/cpython/commit/7d95a1dc7382b55cba7fdd6a110336077584a4f0
github.com
https://github.com/python/cpython/commit/bb3446dda6c49b32e67c11dbbbf221b40be00763
github.com
https://github.com/python/cpython/commit/c88704431ea3248ca769384c13856330976fac1d
github.com
https://github.com/python/cpython/commit/eac4fe3b2c77693790a5ef7dfab127c1fee81bf9
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