CVE-2026-39983 | patrickjuchli basic-ftp up to 5.2.0 path crlf injection

VDB-356635 · CVE-2026-39983 · GCVE-0-2026-39983 PATRICKJUCHLI BASIC-FTP UP TO 5.2.0 PATH CRLF INJECTION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 7.8 $0-$5k 1.39+ Summaryinfo A vulnerability classified as problematic has been found in patrickjuchli basic-ftp up to 5.2.0. This issue affects the function cd/remove/rename/uploadFrom/downloadTo/list/removeDir. This manipulation of the argument path causes crlf injection. This vulnerability is registered as CVE-2026-39983. Remote exploitation of the attack is possible. No exploit is available. It is recommended to upgrade the affected component. Detailsinfo A vulnerability classified as critical was found in patrickjuchli basic-ftp up to 5.2.0. Affected by this vulnerability is the function cd/remove/rename/uploadFrom/downloadTo/list/removeDir. The manipulation of the argument path with an unknown input leads to a crlf injection vulnerability. The CWE definition for the vulnerability is CWE-93. The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is: basic-ftp is an FTP client for Node.js. Prior to 5.2.1, basic-ftp allows FTP command injection via CRLF sequences (\r\n) in file path parameters passed to high-level path APIs such as cd(), remove(), rename(), uploadFrom(), downloadTo(), list(), and removeDir(). The library's protectWhitespace() helper only handles leading spaces and returns other paths unchanged, while FtpContext.send() writes the resulting command string directly to the control socket with \r\n appended. This lets attacker-controlled path strings split one intended FTP command into multiple commands. This vulnerability is fixed in 5.2.1. It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-39983 since 04/08/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit. Upgrading to version 5.2.1 eliminates this vulnerability. Productinfo Vendor patrickjuchli Name basic-ftp Version 5.0 5.1 5.2.0 Website Product: https://github.com/patrickjuchli/basic-ftp/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 7.9 VulDB Meta Temp Score: 7.8 VulDB Base Score: 7.3 VulDB Temp Score: 7.0 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 8.6 CNA Vector (GitHub_M): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Crlf injection CWE: CWE-93 / CWE-74 / CWE-707 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: basic-ftp 5.2.1 Timelineinfo 04/08/2026 CVE reserved 04/09/2026 +1 days Advisory disclosed 04/09/2026 +0 days VulDB entry created 04/09/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: github.com Status: Confirmed CVE: CVE-2026-39983 (🔒) GCVE (CVE): GCVE-0-2026-39983 GCVE (VulDB): GCVE-100-356635 Entryinfo Created: 04/09/2026 19:52 Changes: 04/09/2026 19:52 (65) Complete: 🔍 Cache ID: 99:11F:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸