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.

CVSS

No CVSS.

References

Link	Resource
https://github.com/python/cpython/commit/2bbcf3fb7a420a05605576c0f9468d4675381b5f
https://github.com/python/cpython/commit/5dadc64673ce875ebfb24163907777dae0f6ca06
https://github.com/python/cpython/commit/7d95a1dc7382b55cba7fdd6a110336077584a4f0
https://github.com/python/cpython/commit/bb3446dda6c49b32e67c11dbbbf221b40be00763
https://github.com/python/cpython/commit/c88704431ea3248ca769384c13856330976fac1d
https://github.com/python/cpython/commit/eac4fe3b2c77693790a5ef7dfab127c1fee81bf9
https://github.com/python/cpython/commit/ef12d0dc824baccf737bba1458e5eed3d1e0fceb
https://github.com/python/cpython/issues/87451
https://github.com/python/cpython/pull/149648
https://mail.python.org/archives/list/security-announce@python.org/thread/ITF2BAPBQEPYK3LDMPRSY435JGNHYNDP/

Configurations

No configuration.

History

No history.

Information

Published : 2026-05-13 21:16

Updated : 2026-08-13 01:16

NVD link : CVE-2026-8328

Mitre link : CVE-2026-8328

CVE.ORG link : CVE-2026-8328

JSON object : View

Products Affected

No product.

CWE

CWE-918

Server-Side Request Forgery (SSRF)

{"id": "CVE-2026-8328", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"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"}}], "cvssMetricV40": [{"type": "Secondary", "source": "cna@python.org", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 5.9, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "valueDensity": "NOT_DEFINED", "vectorString": "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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "ACTIVE", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "cna@python.org", "affectedData": [{"repo": "https://github.com/python/cpython", "vendor": "Python Software Foundation", "modules": ["ftplib"], "product": "CPython", "versions": [{"status": "affected", "version": "0", "lessThan": "3.10.21", "versionType": "python"}, {"status": "affected", "version": "3.11.0", "lessThan": "3.11.16", "versionType": "python"}, {"status": "affected", "version": "3.12.0", "lessThan": "3.12.14", "versionType": "python"}, {"status": "affected", "version": "3.13.0", "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"}]}], "published": "2026-05-13T21:16:50.167", "references": [{"url": "https://github.com/python/cpython/commit/2bbcf3fb7a420a05605576c0f9468d4675381b5f", "source": "cna@python.org"}, {"url": "https://github.com/python/cpython/commit/5dadc64673ce875ebfb24163907777dae0f6ca06", "source": "cna@python.org"}, {"url": "https://github.com/python/cpython/commit/7d95a1dc7382b55cba7fdd6a110336077584a4f0", "source": "cna@python.org"}, {"url": "https://github.com/python/cpython/commit/bb3446dda6c49b32e67c11dbbbf221b40be00763", "source": "cna@python.org"}, {"url": "https://github.com/python/cpython/commit/c88704431ea3248ca769384c13856330976fac1d", "source": "cna@python.org"}, {"url": "https://github.com/python/cpython/commit/eac4fe3b2c77693790a5ef7dfab127c1fee81bf9", "source": "cna@python.org"}, {"url": "https://github.com/python/cpython/commit/ef12d0dc824baccf737bba1458e5eed3d1e0fceb", "source": "cna@python.org"}, {"url": "https://github.com/python/cpython/issues/87451", "source": "cna@python.org"}, {"url": "https://github.com/python/cpython/pull/149648", "source": "cna@python.org"}, {"url": "https://mail.python.org/archives/list/security-announce@python.org/thread/ITF2BAPBQEPYK3LDMPRSY435JGNHYNDP/", "source": "cna@python.org"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "cna@python.org", "description": [{"lang": "en", "value": "CWE-918"}]}], "descriptions": [{"lang": "en", "value": "The ftpcp() function in Lib/ftplib.py was not updated when \nCVE-2021-4189 was fixed. While makepasv() was patched to replace \nserver-supplied PASV host addresses with the actual peer address \n(getpeername()[0]), ftpcp() still calls parse227() directly and passes \nthe raw attacker-controllable IP address and port to target.sendport(). This patch is related to\u00a0CVE-2021-4189."}], "lastModified": "2026-08-13T01:16:55.950", "sourceIdentifier": "cna@python.org"}