CVE-2026-102722
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FTP Client Arbitrary File Download via Malicious PASV Reply

Publication date: 2026-09-29

Last updated on: 2026-09-29

Assigner: Eclipse Foundation

Description
In the IPv4 PASV path, the FTP Client accepts whatever address was sent in the server's `227` reply. Validation only covers the parse and the non-zero values, thus a malicious server can name any address and direct the Client there.

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Meta Information

Published
2026-09-29
Last Modified
2026-09-29
Generated
2026-09-29
AI Q&A
2026-09-29
EPSS Evaluated
N/A
NVD
CVE-2026-102722
EUVD
EUVD-2026-89187

Affected Vendors & Products

Currently, no data is known.

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-918 The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

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Executive Summary

This vulnerability involves an FTP client accepting any address sent in a server's 227 reply during an IPv4 PASV command. The client only validates the parse and non-zero values, allowing a malicious server to redirect the client to any address.

Impact Analysis

An attacker could exploit this to trick users into connecting to a malicious server instead of the intended one. This could lead to data theft, unauthorized access, or further attacks like man-in-the-middle.

Compliance Impact

This vulnerability could lead to data breaches, violating GDPR's data protection requirements or HIPAA's security rules for protected health information. Organizations may face penalties for failing to protect data transfers.

Mitigation Strategies

Update your FTP client to a patched version that validates the server's address in the 227 reply. Avoid using FTP clients that do not perform strict validation of the PASV response.

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