CVE-2026-8328 (GCVE-0-2026-8328)

Vulnerability from cvelistv5 – Published: 2026-05-13 20:14 – Updated: 2026-08-13 00:26
VLAI
Title
FTP PASV SSRF, ftpcp() does not use actual peer address, trusts server-supplied PASV host address
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.
Severity
5.9 (Medium)
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
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-14 12:49 UTC
CWE
  • CWE-918 - Server-Side request forgery (SSRF)
Assigner
References
Impacted products
Vendor Product Version
Python Software Foundation CPython Affected: 0 , < 3.10.21 (python)
Affected: 3.11.0 , < 3.11.16 (python)
Affected: 3.12.0 , < 3.12.14 (python)
Affected: 3.13.0 , < 3.13.14 (python)
Affected: 3.14.0 , < 3.14.6 (python)
Affected: 3.15.0a1 , < 3.15.0b2 (python)
Create a notification for this product.
Credits
Qi Deng (https://github.com/ikow) Bénédikt Tran (https://github.com/picnixz) Gregory P. Smith (https://github.com/gpshead)
Show details on NVD website
To clipboard 

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              "url": "https://github.com/python/cpython/commit/5dadc64673ce875ebfb24163907777dae0f6ca06"
            },
            {
              "tags": [
                "patch"
              ],
              "url": "https://github.com/python/cpython/commit/7d95a1dc7382b55cba7fdd6a110336077584a4f0"
            },
            {
              "tags": [
                "patch"
              ],
              "url": "https://github.com/python/cpython/commit/bb3446dda6c49b32e67c11dbbbf221b40be00763"
            },
            {
              "tags": [
                "patch"
              ],
              "url": "https://github.com/python/cpython/commit/c88704431ea3248ca769384c13856330976fac1d"
            },
            {
              "tags": [
                "patch"
              ],
              "url": "https://github.com/python/cpython/commit/eac4fe3b2c77693790a5ef7dfab127c1fee81bf9"
            },
            {
              "tags": [
                "patch"
              ],
              "url": "https://github.com/python/cpython/commit/2bbcf3fb7a420a05605576c0f9468d4675381b5f"
            },
            {
              "tags": [
                "patch"
              ],
              "url": "https://github.com/python/cpython/commit/ef12d0dc824baccf737bba1458e5eed3d1e0fceb"
            }
          ],
          "source": {
            "discovery": "UNKNOWN"
          },
          "title": "FTP PASV SSRF, ftpcp() does not use actual peer address, trusts server-supplied PASV host address",
          "x_generator": {
            "engine": "cvelib 1.8.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "28c92f92-d60d-412d-b760-e73465c3df22",
        "assignerShortName": "PSF",
        "cveId": "CVE-2026-8328",
        "datePublished": "2026-05-13T20:14:33.751Z",
        "dateReserved": "2026-05-11T15:06:00.859Z",
        "dateUpdated": "2026-08-13T00:26:54.111Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.