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Medium, CVSS 6.3amended

flatten-json Prototype Pollution

CVE-2024-36574GHSA-j8px-pjmp-325f

What to do

Vendor response not established. Follow the primary source's mitigation guidance and check back for a fix.

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

  • npm @allanlancioni/flatten-json

    Affected
    <= 1.0.1
    Fixed in
    no fixed version recorded

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
6.3 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
EPSS
  • CVE-2024-36574: 0.42% estimated exploitation activity in the next 30 days; percentile 36.34 (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.

A Prototype Pollution issue in flatten-json 1.0.1 allows an attacker to execute arbitrary code via module.exports.unflattenJSON (flatten-json/index.js:42)

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from ghsa record GHSA-j8px-pjmp-325f

  2. Revision 1 · created ·

    Published from osv record GHSA-j8px-pjmp-325f

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2024-36574

Advisory: flatten-json Prototype Pollution
IDs: CVE-2024-36574, GHSA-j8px-pjmp-325f
Record: https://patchnext.com/advisories/cve-2024-36574 (revision 2, source checked 26 Oct 2026, 12:30 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @allanlancioni/flatten-json: affected <= 1.0.1

## Suggested inspection (read-only)
- `npm ls @allanlancioni/flatten-json --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on @allanlancioni/flatten-json.
- 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-j8px-pjmp-325f (OSV record GHSA-j8px-pjmp-325f lists affected ranges: npm @allanlancioni/flatten-json >=0 <=1.0.1)
- Verified: https://github.com/advisories/GHSA-j8px-pjmp-325f (GitHub-reviewed advisory GHSA-j8px-pjmp-325f lists affected ranges: npm @allanlancioni/flatten-json >=0 <=1.0.1)

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