CVE-2026-102990basic-ftp: Quadratic-time CPU denial of service in Client.list() Unix directory-listing parser (RE_LINE backtracking)
Updated under an hour ago ()
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It affects patrickjuchli basic-ftp. Add what you run to find out whether that includes you.
EPSS puts the chance of exploitation in the next 30 days at 0.37%, higher than 29% of scored CVEs.
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basic-ftp is an FTP client for Node.js. Prior to 6.2.1, Client.list() can be forced by a malicious or compromised FTP server to spend quadratic CPU time parsing a directory listing because the RE_LINE expression in src/parseListUnix.ts backtracks across adjacent variable-length owner and group fields when a long Unix-style line has a valid prefix but cannot satisfy the later size and date fields. parseList() selects a parser from the last nonblank line and then applies it to every line, so a normal final line can select the Unix parser while an earlier crafted line blocks the Node.js event loop and freezes the process. This issue is fixed in version 6.2.1.
- CVSS
- 8.2 HIGH (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- Weakness (CWE)
- CWE-1333
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- 0.37% (percentile 29)
- Assigned by
- GitHub_M
- NVD analysis
- Deferred
- Record last updated
- Sep 30, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
patrickjuchli basic-ftp patrickjuchli:basic_ftp (from the name) | before 6.2.1 | CNA record |
References
- https://github.com/patrickjuchli/basic-ftp/security/advisories/GHSA-c475-qrg2-pj4rx-refsource-confirm
- https://github.com/patrickjuchli/basic-ftp/commit/d0d9e07c56e519587bb50532ac6eadbb0cb0cfe9x-refsource-misc
- https://github.com/patrickjuchli/basic-ftp/releases/tag/v6.2.1x-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.