# CVE-2024-41818: fast-xml-parser regular expression denial of service in currency parsing

Source: https://junglewise.ai/threats/cve-2024-41818-fast-xml-parser-regular-expression-denial-of-service-in-currency  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2024-07-29. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2024-41818 · Severity: low · CVSS 3.1 · Published 2024-07-29

fast-xml-parser is a popular Node.js library for parsing XML data. The library contains a regular expression flaw in its experimental currency parsing feature that allows an attacker to craft specially formatted input to consume excessive CPU resources, causing a denial of service that can make an application unresponsive or crash.

Technologies: [fast-xml-parser (npm)](https://junglewise.ai/threats/technologies/fast-xml-parser). Vendors: [npm](https://junglewise.ai/threats/vendors/npm).

## Quick answers

**Is CVE-2024-41818 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2024-41818 being exploited in the wild.

**How severe is CVE-2024-41818?** Low severity, with a CVSS score of 3.1, published 29 July 2024.

**Which products and versions are affected?** fast-xml-parser (npm) SEMVER:introduced=4.3.5,fixed=4.4.1.

**Is there a fix for CVE-2024-41818?** Yes. fast-xml-parser (npm): upgrade to 4.4.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2024-41818 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2024-41818?** Check whether you run fast-xml-parser (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- fast-xml-parser (npm): upgrade to 4.4.1 or later

  ```sh
  npm install fast-xml-parser@4.4.1
  ```


## Technical details

A ReDoS (regular expression denial of service) vulnerability exists in the currency.js module's regex pattern used to parse currency values in version 5 (experimental). An attacker can provide input consisting of many tab characters followed by a period (e.g., '\t'.repeat(13337) + '.') which triggers catastrophic backtracking in the regex engine, consuming excessive CPU cycles. The vulnerability affects versions 4.2.4 through 4.4.0. No authentication or user interaction is required; the vulnerability is triggered whenever untrusted input is processed by the currency parser. The issue has been patched in version 4.4.1.

## Affected products

- NaturalIntelligence fast-xml-parser 4.2.4 through 4.4.0

## Identifiers

- CVE-2024-41818
- GHSA-mpg4-rc92-vx8v

## Timeline

- 2024-07-29: disclosed
- 2024-07-29: patched: Patched in version 4.4.1

## References

- [https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-mpg4-rc92-vx8v](https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-mpg4-rc92-vx8v)

## Related threats

- [fast-xml-parser: Quadratic CPU consumption scanning unterminated stop-node tags](https://junglewise.ai/threats/cve-2026-126066-fast-xml-parser-allows-users-to-process-xml-from-js-object)
- [fast-xml-parser DOCTYPE reset entity expansion limits bypass](https://junglewise.ai/threats/cve-2026-73569-fast-xml-parser-doctype-reset-entity-expansion-limits-bypass)
- [NaturalIntelligence fast-xml-parser XML injection in XMLBuilder](https://junglewise.ai/threats/cve-2026-41650-naturalintelligence-fast-xml-parser-xml-injection-in-xmlbuilder)
- [fast-xml-parser entity expansion bypass via falsy zero check](https://junglewise.ai/threats/cve-2026-33349-fast-xml-parser-entity-expansion-bypass-via-falsy-zero-check)
- [fast-xml-parser numeric entity expansion bypass](https://junglewise.ai/threats/cve-2026-33036-fast-xml-parser-numeric-entity-expansion-bypass)