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High, CVSS 7.5amended

Prototype Pollution in object-path-set

CVE-2021-23507GHSA-h6pr-c536-6rjg

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (object-path-set 1.0.2), 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
7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
  • CVE-2021-23507: 2.13% estimated exploitation activity in the next 30 days; percentile 81.94 (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.

The package object-path-set before 1.0.2 are vulnerable to Prototype Pollution via the setPath method, as it allows an attacker to merge object prototypes into it. Note: This vulnerability derives from an incomplete fix in https://security.snyk.io/vuln/SNYK-JS-OBJECTPATHSET-607908

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

    Amended from ghsa record GHSA-h6pr-c536-6rjg

  2. Revision 1 · created ·

    Published from osv record GHSA-h6pr-c536-6rjg

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-2021-23507

Advisory: Prototype Pollution in object-path-set
IDs: CVE-2021-23507, GHSA-h6pr-c536-6rjg
Record: https://patchnext.com/advisories/cve-2021-23507 (revision 2, source checked 26 Oct 2026, 12:21 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: object-path-set 1.0.2. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm object-path-set: affected < 1.0.2; fixed in 1.0.2

## Suggested inspection (read-only)
- `npm ls object-path-set --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 object-path-set.
- 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-h6pr-c536-6rjg (OSV record GHSA-h6pr-c536-6rjg lists affected ranges: npm object-path-set >=0 <1.0.2 (fixed))
- Verified: https://github.com/advisories/GHSA-h6pr-c536-6rjg (GitHub-reviewed advisory GHSA-h6pr-c536-6rjg lists affected ranges: npm object-path-set >=0 <1.0.2)

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