CVE-2026-41324

Description

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.

CVSS Details

CVSS Score

7.5

Severity

HIGH

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Configurations (Affected Products)

cpe:2.3:a:patrickjuchli:basic-ftp:*:*:*:*:*:node.js:*:* - VULNERABLE

basic-ftp < 5.3.0

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

// PoC for CVE-2026-41324 (basic-ftp DoS)
// This simulates a vulnerable client connecting to a malicious server.

const { Client } = require('basic-ftp');

async function triggerVulnerability() {
    const client = new Client();
    try {
        console.log("Connecting to malicious FTP server...");
        // Attacker controls this server and sends infinite data on LIST command
        await client.access({
            host: "192.168.1.100", 
            user: "anonymous",
            password: "anonymous"
        });

        // Triggering the unbounded memory growth
        // The server response to list() is crafted to be extremely large/never-ending
        console.log("Listing files...");
        const files = await client.list();
        console.log(files);
    } catch (err) {
        console.error("Error or Crash occurred:", err);
    } finally {
        client.close();
    }
}

triggerVulnerability();

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-41324
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-41324
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-41324/
[4] VulDB https://vuldb.com/cve/CVE-2026-41324
[5] https://github.com/patrickjuchli/basic-ftp/security/advisories/GHSA-rp42-5vxx-qpwr
[6] https://github.com/patrickjuchli/basic-ftp/security/advisories/GHSA-rp42-5vxx-qpwr

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-41324", "sourceIdentifier": "[email protected]", "published": "2026-04-24T04:16:20.767", "lastModified": "2026-04-27T17:48:44.593", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-400"}, {"lang": "en", "value": "CWE-770"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:patrickjuchli:basic-ftp:*:*:*:*:*:node.js:*:*", "versionEndExcluding": "5.3.0", "matchCriteriaId": "248CB3D1-2635-4E2F-80F4-CCF59A675258"}]}]}], "references": [{"url": "https://github.com/patrickjuchli/basic-ftp/security/advisories/GHSA-rp42-5vxx-qpwr", "source": "[email protected]", "tags": ["Exploit", "Mitigation", "Vendor Advisory"]}, {"url": "https://github.com/patrickjuchli/basic-ftp/security/advisories/GHSA-rp42-5vxx-qpwr", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Mitigation", "Vendor Advisory"]}]}}