Skip to content
Fencer Vulns
medium 5.9

CVE-2026-8328 json

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

published 2026-05-13 5 mo ago modified 2026-10-26 13 d ago also BIT-libpython-2026-8328 , BIT-python-2026-8328 , BIT-python-min-2026-8328 , EUVD-2026-30177

cvss
5.9
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 39%
public exploits
0
none known

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.

Patch / fix

  • bitnami libpython 3.10.21, 3.11.16, 3.12.14, 3.13.14, 3.14.6
  • bitnami python 3.10.21, 3.11.16, 3.12.14, 3.13.14, 3.14.6
  • bitnami python-min 3.10.21, 3.11.16, 3.12.14, 3.13.14, 3.14.6
  • Python Software Foundation CPython 3.10.21, 3.11.16, 3.12.14, 3.13.14, 3.14.6, 3.15.0b2
  • pypy3 Debian 14 8.0.0+dfsg-1
  • python3.11 Debian 12 3.11.2-6+deb12u9
  • python3.13 Debian 13 3.13.5-2+deb13u3
  • python3.14 Debian 14 3.14.6-1

debian advisories DEBIAN-CVE-2026-8328

  • python3.10 Ubuntu 22.04 LTS 3.10.12-1~22.04.16
  • python3.12 Ubuntu 24.04 LTS 3.12.3-1ubuntu0.15
  • python3.14 Ubuntu 26.04 LTS 3.14.4-1ubuntu0.1

ubuntu advisories UBUNTU-CVE-2026-8328

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • python3.13 hummingbird 1 3.13.15-1.3.hum1
  • python3.13-idle hummingbird 1 3.13.15-1.3.hum1
  • python3.13-libs hummingbird 1 3.13.15-1.3.hum1
  • python3.13-test hummingbird 1 3.13.15-1.3.hum1
  • python3.13-tkinter hummingbird 1 3.13.15-1.3.hum1
  • python3.13-freethreading hummingbird 1 3.13.15-1.3.hum1
  • python3.12 hummingbird 1 3.12.14-1.3.hum1
  • python3.12-idle hummingbird 1 3.12.14-1.3.hum1

red hat advisories RHSA-2026:68309RHSA-2026:68154RHSA-2026:68135RHSA-2026:68132RHSA-2026:67572

  • python3 SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +11 more 3.6.15-150300.10.129.1
  • python3-core SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +12 more 3.6.15-150300.10.129.1
  • grafana Multi Linux Manager Tools SLE-15 12.4.10-150002.4.27.1
  • mgr-push Multi Linux Manager Tools SLE-15 5.2.5-150002.3.12.1
  • spacecmd Multi Linux Manager Tools SLE-15 5.2.10-150002.3.15.1
  • uyuni-tools Multi Linux Manager Tools SLE-Micro-5, Multi Linux Manager Tools SLE-15 5.2.17-150002.3.20.1
  • venv-salt-minion Multi Linux Manager Tools SLE-Micro-5, Multi Linux Manager Tools SLE-15 3006.0-150002.5.22.1
  • spacewalk-client-tools Multi Linux Manager Tools SLE-15 5.2.7-150002.3.12.1

suse advisories SUSE-SU-2026:4754-1SUSE-SU-2026:4585-1SUSE-SU-2026:4584-1SUSE-SU-2026:4583-1SUSE-SU-2026:4582-1SUSE-SU-2026:4581-1

  • python313 openSUSE Leap 16.0 3.13.14-160000.2.1
  • python313-core openSUSE Leap 16.0 3.13.14-160000.2.1
  • python313-nogil openSUSE Leap 16.0 3.13.14-160000.2.1
  • python313-documentation openSUSE Leap 16.0 3.13.14-160000.2.1
  • python313-nogil-nogil-core openSUSE Leap 16.0 3.13.14-160000.2.1
  • python311 openSUSE Tumbleweed 3.11.15-8.1
  • python312 openSUSE Tumbleweed 3.12.13-8.1
  • python313 openSUSE Tumbleweed 3.13.14-1.1

opensuse advisories openSUSE-SU-2026:21595-1openSUSE-SU-2026:11427-1openSUSE-SU-2026:11428-1openSUSE-SU-2026:11342-1openSUSE-SU-2026:11285-1openSUSE-SU-2026:11181-1

  • python3 Alpine 3.24 3.14.7-r0

alpine advisories ALPINE-CVE-2026-8328

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • python3 Azure Linux 3.0 3.12.9-13

azure linux advisories AZL-86913

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-8328 updated cvss 5.3

python: Python: FTP connection redirection via ftpcp() function bypass

  • Red Hat Hardened Images python3 3.14.7-1.2.hum1, python3.14 3.14.7-1.2.hum1, python3.10 3.10.21-1.3.hum1, python3.11 3.11.16-1.4.hum1, python3.12 3.12.14-1.3.hum1, python3.13 3.13.15-1.3.hum1, +27 more
    fixed: vendor fix RHSA-2026:67572
  • Red Hat Hardened Images hi/python
    not affected: component not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
5 mo ago

Exploit prediction

0.46% chance of exploitation in the next 30 days, higher than 39% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 5.9 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
CNA 4.0 5.9 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/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

Affected packages

ecosystem package affected fixed in
bitnami libpython
<3.10.21
>=3.11.0, <3.11.16
>=3.12.0, <3.12.14
>=3.13.0, <3.13.14
>=3.14.0, <3.14.6
3.10.21
3.11.16
3.12.14
3.13.14
3.14.6
bitnami python
<3.10.21
>=3.11.0, <3.11.16
>=3.12.0, <3.12.14
>=3.13.0, <3.13.14
>=3.14.0, <3.14.6
3.10.21
3.11.16
3.12.14
3.13.14
3.14.6
bitnami python-min
<3.10.21
>=3.11.0, <3.11.16
>=3.12.0, <3.12.14
>=3.13.0, <3.13.14
>=3.14.0, <3.14.6
3.10.21
3.11.16
3.12.14
3.13.14
3.14.6

Affected products

  • Python Software Foundation CPython

Classification

Weakness
  • CWE-918 Server-Side Request Forgery

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.