8.2

CVE-2026-102990: basic-ftp: Quadratic-time CPU denial of service in Client.list() Unix directory-listing parser (RE_LINE backtracking)

Deferred
AliasesUBUNTU-CVE-2026-102990DEBIAN-CVE-2026-102990CGA-2vg5-pv9p-867w
Published 30-09-2026Last modified 30-09-2026

Vulnerability summary

CVE-2026-102990 is a high (CVSS 8.2) vulnerability in patrickjuchli basic-ftp. EPSS estimates a 0.37% chance of exploitation in the next 30 days, higher than 30.9% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 8.2 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 0% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
8.2/10
010
High · v4.0 (CVE.org)
EPSS score
0.37%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Timeline

  1. 30-09-2026
    PublishedVulnerability first disclosed.
  2. 30-09-2026
    Last modifiedVulnerability information updated.

Description

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 metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

0.37%

Chance of exploitation in the next 30 days

Percentile

31%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.37% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Chainguard25 products
  • code-server< 4.140.0-r1
  • gemini-cli< 0.63.0-r2
  • kibana-9.2All versions (No fix recorded) | < 9.2.8-r29
  • opensearch-dashboards-2-fips-security-dashboards-plugin< 2.19.6-r12
  • opensearch-dashboards-2-security-dashboards-plugin< 2.19.6-r23
Wolfi2 products
  • code-server< 4.140.0-r1
  • opensearch-dashboards-3-security-dashboards-plugin< 3.8.0-r10
Debian1 product
  • node-proxy-agentsAll versions (No fix recorded) | < 0~2025070717+~cs16.2.9-1
Npm1 product
  • basic-ftp< 6.2.1
Patrickjuchli1 product
Ubuntu1 product
  • node-proxy-agentsAll versions (No fix recorded)

6 vendors · 31 products

References

9 links