EUVD-2026-25390
GHSA-rp42-5vxx-qpwr
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Primary rating from GitHub Advisory.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
7Blast Radius
ecosystem impact- 2 npm packages depend on basic-ftp (1 direct, 1 indirect)
Ecosystem-wide dependent count for version 5.3.0.
DescriptionGitHub Advisory
basic-ftp is an FTP client for Node.js. Versions prior to 5.3.0 are vulnerable to denial of service through unbounded memory growth while processing directory listings from a remote FTP server. A malicious or compromised server can send an extremely large or never-ending listing response to Client.list(), causing the client process to consume memory until it becomes unstable or crashes. Version 5.3.0 fixes the issue.
AnalysisAI
Denial of service in basic-ftp for Node.js allows remote malicious FTP servers to crash client applications via unbounded memory consumption during directory listing operations. Attackers controlling or compromising an FTP server can send infinite or extremely large listing responses to Client.list() calls, exhausting client memory until process termination. Unauthenticated network attack with low complexity (CVSS:3.1 AV:N/AC:L/PR:N). No public exploit identified at time of analysis, though attack concept is straightforward for anyone operating a malicious FTP server.
Technical ContextAI
This vulnerability affects the basic-ftp library (versions prior to 5.3.0), a Node.js FTP client implementation. The root cause is improper resource management (CWE-400) during directory listing parsing. When the Client.list() method processes FTP LIST command responses, it lacks bounds checking or memory limits on the incoming data stream. In Node.js environments, unbounded string or buffer accumulation during parsing can quickly exhaust heap memory, especially when dealing with malicious servers that stream gigabytes of directory listing data or never send an end-of-transmission marker. The vulnerability resides in client-side FTP protocol handling code, where the expectation of well-behaved servers leads to unsafe memory allocation patterns.
RemediationAI
Upgrade basic-ftp to version 5.3.0 or later, which implements memory bounds checking during directory listing operations. Update package.json dependencies and run 'npm update basic-ftp' or equivalent package manager commands to install the patched version. Vendor advisory with technical details: https://github.com/patrickjuchli/basic-ftp/security/advisories/GHSA-rp42-5vxx-qpwr. If immediate upgrading is not feasible, implement these compensating controls: (1) restrict FTP connections to an allowlist of verified, trusted servers only - do not accept user-supplied FTP URLs or dynamically discovered endpoints; (2) deploy resource limits using Node.js --max-old-space-size flag to contain memory exhaustion impact, though this trades DoS stability for crash recovery; (3) implement application-level timeouts on Client.list() calls with aggressive thresholds (e.g., 30-60 seconds) to abort suspiciously long listing operations, noting this may break legitimate connections to servers with extremely large directories; (4) run FTP client operations in isolated worker processes or containers with memory cgroups limits to prevent single-process crashes from affecting entire applications. These workarounds reduce but do not eliminate risk and may cause operational false positives. Patching to 5.3.0 remains the definitive solution.
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Same weakness CWE-400 – Uncontrolled Resource Consumption
View allSame technique Denial Of Service
View allVendor StatusVendor
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