SSRF in Python Software Foundation Cpython
CVE-2026-8328
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.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
EPSS exploit prediction
EPSS: 0.007 (50.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 50.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.007 · change: +0.002
Affected products
- Python Software Foundation Cpython — versions 3.14.0, 0, 3.13.0
Weakness classification (CWE)
References
- github.com/python/cpython/issues/87451 (issue-tracking)
- github.com/python/cpython/pull/149648 (patch)
- mail.python.org/archives/list/security-announce@python.org/thread/ITF2BAPBQEPYK… (vendor-advisory)
- github.com/python/cpython/commit/5dadc64673ce875ebfb24163907777dae0f6ca06 (patch)
- github.com/python/cpython/commit/7d95a1dc7382b55cba7fdd6a110336077584a4f0 (patch)
- github.com/python/cpython/commit/bb3446dda6c49b32e67c11dbbbf221b40be00763 (patch)
- github.com/python/cpython/commit/c88704431ea3248ca769384c13856330976fac1d (patch)
- github.com/python/cpython/commit/eac4fe3b2c77693790a5ef7dfab127c1fee81bf9 (patch)
- github.com/python/cpython/commit/2bbcf3fb7a420a05605576c0f9468d4675381b5f (patch)
- github.com/python/cpython/commit/ef12d0dc824baccf737bba1458e5eed3d1e0fceb (patch)