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Made with love by Amit Schendel & Alon Barad

CVE-2025-15284

The Limit Does Not Exist: Crashing Node.js via CVE-2025-15284

Amit Schendel
Amit Schendel
Senior Security Researcher

Jan 1, 2026·5 min read·103 visits

Executive Summary (TL;DR)

The `qs` library, used by Express and others to parse query strings, has a setting called `arrayLimit` to prevent memory exhaustion. Versions < 6.14.1 fail to apply this limit to bracket notation (`key[]=value`). Attackers can send a single request with thousands of keys to crash the server. Patch immediately to 6.14.1.

A logic flaw in the ubiquitous `qs` library allows attackers to bypass the `arrayLimit` security control using bracket notation. This enables unauthenticated Denial of Service (DoS) attacks against Node.js applications by exhausting server memory with massive arrays.

Official Patches

qs (GitHub)Commit fixing the logic flaw in parse.js

Fix Analysis (1)

Technical Appendix

CVSS Score
7.5/ 10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Probability
0.10%
Top 100% most exploited

Affected Systems

Node.js applications using `express`NestJS applicationsKoa applications using `koa-qs`Any Node.js service using `qs < 6.14.1`

Affected Versions Detail

Product
Affected Versions
Fixed Version
qs
ljharb
< 6.14.16.14.1
AttributeDetail
CWE IDCWE-20
Attack VectorNetwork
CVSS7.5 (High)
ImpactDenial of Service (DoS)
Exploit StatusPoC Available
Fixed Version6.14.1

MITRE ATT&CK Mapping

T1499.004Endpoint Denial of Service: Application or System Exploitation
Impact
CWE-20
Improper Input Validation

Improper Input Validation

Known Exploits & Detection

GitHub Security AdvisoryAdvisory containing PoC for arrayLimit bypass

Vulnerability Timeline

Patch committed to GitHub
2025-02-17
GitHub Security Advisory Published
2025-02-18

References & Sources

  • [1]NVD - CVE-2025-15284
  • [2]GitHub Advisory: qs arrayLimit Bypass

Attack Flow Diagram

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