7.5

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2024-41818

CVE-2024-41818: fast-xml-parser vulnerable to ReDOS at currency parsing

Summary

A ReDOS that exists on currency.js was discovered by Gauss Security Labs R&D team.

Details

https://github.com/NaturalIntelligence/fast-xml-parser/blob/v4.4.0/src/v5/valueParsers/currency.js#L10 contains a vulnerable regex

PoC

pass the following string '\t'.repeat(13337) + '.'

Impact

Denial of service during currency parsing in experimental version 5 of fast-xml-parser-library

https://gauss-security.com

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2024-41818

CVE-2024-41818:

7.5

CVSS Score

3.1

-

CVSS Score

Basic Information

Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
fast-xml-parser	npm	>= 4.3.5, < 4.4.1	4.4.1

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability stems from:

The currencyCheckRegex pattern in currency.js has inefficient regex constructs (nested optional groups and unbounded quantifiers)
The original parse function lacked input length validation before regex execution
The PoC demonstrates exploitation with a long string of 13337 tabs followed by '.', which would cause exponential regex evaluation time
The patch added a maxLength check (200 characters) before regex processing, confirming the root cause was unconstrained input size
CWE-1333 (Inefficient Regex) is explicitly listed, matching the described vulnerability mechanism

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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7.5

-

Basic Information

Basic Information

Concerned about an active attack path?

CVE-2024-41818: fast-xml-parser vulnerable to ReDOS at currency parsing

Summary

Details

PoC

Impact

CVE-2024-41818:

7.5

-

Basic Information

Basic Information

Technical Details

Technical Details

Vulnerability IntelligenceMiggo AI

Root Cause Analysis

Vulnerable functions

WAF Protection Rules

WAF Rule

Reasoning

Vulnerability IntelligenceMiggo AI

CVE-2024-41818: fast-xml-parser vulnerable to ReDOS at currency parsing

Summary

Details

PoC

Impact

Technical Details

Vulnerability IntelligenceMiggo AI

Root Cause Analysis

Vulnerable functions

WAF Protection Rules

WAF Rule

Reasoning

Basic Information

Basic Information

7.5

7.5

Vulnerability Intelligence
Miggo AI

Vulnerability Intelligence
Miggo AI

Vulnerability Intelligence
Miggo AI