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High, CVSS 8.7amended

fast-xml-parser vulnerable to ReDOS at currency parsing

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

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (fast-xml-parser 4.4.1), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
8.7 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N · score source
EPSS
  • CVE-2024-41818: 0.83% estimated exploitation activity in the next 30 days; percentile 57.55 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

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

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from ghsa record GHSA-mpg4-rc92-vx8v

  2. Revision 2 · amended ·

    Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

  3. Revision 1 · created ·

    Published from osv record GHSA-mpg4-rc92-vx8v

Agent brief

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# Patch Next advisory brief: CVE-2024-41818

Advisory: fast-xml-parser vulnerable to ReDOS at currency parsing
IDs: CVE-2024-41818, GHSA-mpg4-rc92-vx8v
Record: https://patchnext.com/advisories/cve-2024-41818 (revision 3, source checked 26 Oct 2026, 12:31 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.7)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: fast-xml-parser 4.4.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm fast-xml-parser: affected >= 4.3.5, < 4.4.1; fixed in 4.4.1

## Suggested inspection (read-only)
- `npm ls fast-xml-parser --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on fast-xml-parser.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-mpg4-rc92-vx8v (OSV record GHSA-mpg4-rc92-vx8v lists affected ranges: npm fast-xml-parser >=4.3.5 <4.4.1 (fixed))
- Verified: https://github.com/advisories/GHSA-mpg4-rc92-vx8v (GitHub-reviewed advisory GHSA-mpg4-rc92-vx8v lists affected ranges: npm fast-xml-parser >=4.3.5 <4.4.1)

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