How severe is CVE-2026-27699?

CVE-2026-27699 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.

Is CVE-2026-27699 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-27699?

CVE-2026-27699 affects Patrickjuchli Basic-ftp. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-27699?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-27699 have an EU (EUVD) identifier?

Yes. CVE-2026-27699 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-8643.

When was CVE-2026-27699 published?

CVE-2026-27699 was published on 2026-02-25 and last updated on 2026-06-17.

CVE-2026-27699

CVE-2026-27699 is a critical-severity vulnerability in Patrickjuchli Basic-ftp with a CVSS 3.x base score of 9.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-22.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
EPSS exploit prediction: 1% (41st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-8643
Weakness: CWE-22
Affected product: Patrickjuchli Basic-ftp
Published: 2026-02-25
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2026-27699?: 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.
How severe is CVE-2026-27699?: CVE-2026-27699 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.
Is CVE-2026-27699 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-27699?: CVE-2026-27699 affects Patrickjuchli Basic-ftp. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-27699?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-27699 have an EU (EUVD) identifier?: Yes. CVE-2026-27699 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-8643.
When was CVE-2026-27699 published?: CVE-2026-27699 was published on 2026-02-25 and last updated on 2026-06-17.

References

Affected products (1)

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

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