CVE-2026-8328
FTP PASV SSRF, ftpcp() does not use actual peer address, trusts server-supplied PASV host address
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.
INFO
Published Date :
May 13, 2026, 9:16 p.m.
Last Modified :
June 30, 2026, 4:16 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-8328
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 4.0 | MEDIUM | 28c92f92-d60d-412d-b760-e73465c3df22 | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Update the ftplib.py library.
- Ensure ftpcp() uses peer address, not raw IP.
- Verify the makepasv() patch is applied correctly.
- Test the ftplib module for vulnerabilities.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-8328.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-8328 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-8328
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-8328 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-8328 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
Jun. 30, 2026
Action Type Old Value New Value Added Reference https://github.com/python/cpython/commit/2bbcf3fb7a420a05605576c0f9468d4675381b5f Added Reference https://github.com/python/cpython/commit/ef12d0dc824baccf737bba1458e5eed3d1e0fceb -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://github.com/python/cpython', 'vendor': 'Python Software Foundation', 'modules': ['ftplib'], 'product': 'CPython', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '3.13.14', 'versionType': 'python'}, {'status': 'affected', 'version': '3.14.0', 'lessThan': '3.14.6', 'versionType': 'python'}, {'status': 'affected', 'version': '3.15.0a1', 'lessThan': '3.15.0b2', 'versionType': 'python'}], 'defaultStatus': 'unaffected'}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-8328', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-05-14T12:49:18.311219Z'} -
CVE Modified by [email protected]
Jun. 10, 2026
Action Type Old Value New Value Added Reference https://github.com/python/cpython/commit/5dadc64673ce875ebfb24163907777dae0f6ca06 Added Reference https://github.com/python/cpython/commit/7d95a1dc7382b55cba7fdd6a110336077584a4f0 Added Reference https://github.com/python/cpython/commit/bb3446dda6c49b32e67c11dbbbf221b40be00763 Added Reference https://github.com/python/cpython/commit/c88704431ea3248ca769384c13856330976fac1d Added Reference https://github.com/python/cpython/commit/eac4fe3b2c77693790a5ef7dfab127c1fee81bf9 -
New CVE Received by [email protected]
May. 13, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-918 Added Reference https://github.com/python/cpython/issues/87451 Added Reference https://github.com/python/cpython/pull/149648 Added Reference https://mail.python.org/archives/list/[email protected]/thread/ITF2BAPBQEPYK3LDMPRSY435JGNHYNDP/