CVE-2026-27699 | Basic FTP has Path Traversal Vulnerability in its downloadToDir() method

Exp

The `basic-ftp` FTP client library for Node.js contains a path traversal vulnerability (CWE-22) in versions prior to 5.2.0 in the `downloadToDir()` method. A malicious FTP server can send directory listings with filenames containing path traversal sequences (`../`) that cause files to be written outside the intended download directory. Version 5.2.0 patches the issue.

Published: 2026-02-25 Last update: 2026-02-26 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-27699 is rated High Exploit Risk (63.8/100): CVSS Critical severity, with low exploitation likelihood (EPSS 0.15%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2026-27699

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2026-27699

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-04 0.15% 0.15% +0.01%
2 2026-04-21 0.18% 0.15% -0.03%
3 2026-04-17 — 0.18% —

Full EPSS history (5 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-27699

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.1 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.2 [email protected]
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]

Weakness enumeration for CVE-2026-27699

GitHub Security Advisory for CVE-2026-27699

GHSA-5rq4-664w-9x2c · Severity: critical · Ecosystem: npm — Basic FTP has Path Traversal Vulnerability in its downloadToDir() method

OS Trackers for CVE-2026-27699

vendor priority summary link
debian not yet assigned CVE-2026-27699 not yet assigned priority: Debian including 1 source packages (node-proxy-agents), 3 status rows across 3 suites (forky, sid, trixie): resolved 3. https://security-tracker.debian.org/tracker/CVE-2026-27699
redhat high — https://access.redhat.com/security/cve/CVE-2026-27699
suse high CVE-2026-27699 severity important: SUSE including 2 source package names (agama, agama-scripts), 4 product×package rows across 2 product lines (SUSE Linux Enterprise Server 16.0, SUSE Linux Enterprise Server for SAP applications 16.0): Known Not Affected 4. https://www.suse.com/security/cve/CVE-2026-27699/
ubuntu medium CVE-2026-27699 medium priority: Ubuntu including 1 source packages (node-proxy-agents), 4 status rows across 4 suites (jammy, noble, questing, upstream): needs-triage 3, DNE 1. https://ubuntu.com/security/CVE-2026-27699

Affected software / configurations for CVE-2026-27699

Vendor Product Version Raw CPE
patrickjuchli basic-ftp < 5.2.0 cpe:2.3:a:patrickjuchli:basic-ftp:*:*:*:*:*:node.js:*:*

References for CVE-2026-27699

cvelogic Threat Intelligence