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.
CVE-2026-102990
HIGHPre-NVD 8.28.2—Trending — 3 sources updated this week
EchelonGraph scoreMEDIUM confidence
This high-severity CVE scores 8.2 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4% (28th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: epss, secondary
8.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 8.2Exploit: None knownExposed services: Not assessed
A fix is available — apply it.
- CVSS v3
- 8.2
- EG Score
- 8.2HIGHmedium confidence
- EG Risk
- 42EG Risk 42/100CISA SSVC
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity82% × 45%Exploitation0% × 40%Automatability30% × 15%CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high. - EPSS PROB
- 0.4%
- EPSS %ILE
- 28th
- KEV
- Not listed
CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).
A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table
Published
September 30, 2026
Last Modified
September 30, 2026
Advisory Details (3)
Auto-updated Sep 30, 2026🔬 Proof of concept available. Patch available. Sources: github_release, github, github_commit.
github_release Patch Available
6.2.1
Patch available: patrickjuchli/basic-ftp v6.2.1
https://github.com/patrickjuchli/basic-ftp/releases/tag/v6.2.1github_commit Patch Available
commit d0d9e07c56e5 (patrickjuchli/basic-ftp)
Patch available: patrickjuchli/basic-ftp v6.2.1 (contains commit d0d9e07c56e5)
https://github.com/patrickjuchli/basic-ftp/commit/d0d9e07c56e519587bb50532ac6eadbb0cb0cfe9github Patch Available🟡 PoC Available
Quadratic-time CPU denial of service in Client.list() Unix directory-listing parser (RE_LINE backtracking) · Advisory · patrickjuchli/basic-ftp · GitHub
https://github.com/patrickjuchli/basic-ftp/security/advisories/GHSA-c475-qrg2-pj4rVendor Advisories for CVE-2026-102990(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Affected Packages
(1 across 1 ecosystem)
npm(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| basic-ftp | — | 6.2.1 | — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 8× in last 7d / 8× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-10-04 01:07 UTCEG score recompute
- 2026-10-03 14:25 UTCEPSS rescore
- 2026-10-02 23:55 UTCEG score recompute
- 2026-10-01 22:40 UTCEG score recompute
- 2026-10-01 19:49 UTCEPSS rescore
- 2026-09-30 20:22 UTCEG score recompute
- 2026-09-30 19:51 UTCEG score recompute
- 2026-09-30 19:50 UTCMITRE cvelistV5first tracked
Related CVEs(same product + same CWE)
Same product
4 shownnpm:basic-ftp
Frequently asked(5)
What is CVE-2026-102990?
CVE-2026-102990 is a high vulnerability published on September 30, 2026. 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…
When was CVE-2026-102990 disclosed?
CVE-2026-102990 was first published on September 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-102990 actively exploited?
CVE-2026-102990 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (28th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-102990?
CVE-2026-102990 has a CVSS base score of 8.2 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-102990?
A fix for CVE-2026-102990 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-102990 are linked in the Vendor Advisories panel on this page.
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-102990
Is Your Infrastructure Affected by CVE-2026-102990?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.