Vulnerabilities in pkg:npm/meteor

PACKAGE
Advisory Identifier: GHSA-j3v9-6gc7-vf5f
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Advisory Summary

CVE-2025-4727 is a MODERATE (CVSS 3.7) meteor affected by inefficient regular vulnerability (CWE-400: Uncontrolled Resource Consumption) affecting Meteor libraries in the npm ecosystem. The issue involves meteor affected by inefficient regular expression complexity. Remediation is available in the latest vendor maintenance releases.

1 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:npm/meteor

1 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:npm/meteor. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-j3v9-6gc7-vf5f CVE-2025-4727 MODERATE Meteor Affected By Inefficient Regular Expression Complexity

CVE-2025-4727 at a Glance

CVE Identifier CVE-2025-4727
GHSA Identifier GHSA-j3v9-6gc7-vf5f
Severity MODERATE
CVSS v3.1 Base Score 3.7
CWE Classification CWE-400: Uncontrolled Resource Consumption
Affected Product Meteor
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 3.7

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability Low (A:L)

How to Fix CVE-2025-4727

To remediate this vulnerability, upgrade all affected Meteor dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

meteor fixed: Latest secure release 
npm install meteor@Latest secure release
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls meteor

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2025-4727, inspect your project dependencies using npm:

npm ls meteor

Analyze the terminal output to locate any version of Meteor in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The npm ls meteor command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-400: Uncontrolled Resource Consumption, where the product does not properly control the allocation and maintenance of a limited resource. In Meteor, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

A vulnerability was found in Meteor up to 3.2.1 and classified as problematic. This issue affects the function Object.assign of the file packages/ddp-server/livedata_server.js. The manipulation of the argument forwardedFor leads to inefficient regular expression complexity. The attack may be initiated remotely. The complexity of an attack is rather high. The exploitation is known to be difficult. The exploit has been disclosed to the public and may be used. Upgrading to version 3.2.2 is able to address this issue. The identifier of the patch is f7ea6817b90952baaea9baace2a3b4366fee6a63. It is recommended to upgrade the affected component.

CVE-2025-4727 Affected Meteor Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
meteor
npm/meteor
npm
≤ 3.2.1

References

NVD — CVE-2025-4727 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-4727
Meteor Source Repository REPOSITORY
https://github.com/meteor/meteor/issues/13713
Meteor Source Repository REPOSITORY
https://github.com/meteor/meteor/pull/13721
Security Fix Commit FIX COMMIT
https://github.com/meteor/meteor/commit/f7ea6817b90952baaea9baace2a3b4366fee6a63
Meteor Source Repository REPOSITORY
https://github.com/meteor/meteor
Meteor Release RELEASE
https://github.com/meteor/meteor/releases/tag/release/METEOR%403.2.2
vuldb.com/ WEB
https://vuldb.com/?ctiid.309029
vuldb.com/ WEB
https://vuldb.com/?id.309029
vuldb.com/ WEB
https://vuldb.com/?submit.570441

Frequently Asked Questions

What is CVE-2025-4727?
CVE-2025-4727 is a security vulnerability in Meteor involving Meteor Affected By Inefficient Regular Expression Complexity under CWE-400: Uncontrolled Resource Consumption.
Which Meteor versions are affected?
Affected versions include releases prior to current release patches across affected packages: meteor.
What version fixes CVE-2025-4727?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is meteor affected?
Yes, meteor is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2025-4727?
CVE-2025-4727 has a CVSS v3.1 base score of 3.7 (MODERATE) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L.
What CWE is associated with CVE-2025-4727?
CVE-2025-4727 is classified under CWE-400: Uncontrolled Resource Consumption (The product does not properly control the allocation and maintenance of a limited resource.).
How can I check npm dependencies for CVE-2025-4727?
Run the dependency tree command: 'npm ls meteor'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-j3v9-6gc7-vf5f",
  "modified" : "2025-05-16T17:44:54Z",
  "published" : "2025-05-16T00:31:08Z",
  "aliases" : [ "CVE-2025-4727" ],
  "summary" : "Meteor Affected By Inefficient Regular Expression Complexity",
  "details" : "A vulnerability was found in Meteor up to 3.2.1 and classified as problematic. This issue affects the function Object.assign of the file packages/ddp-server/livedata_server.js. The manipulation of the argument forwardedFor leads to inefficient regular expression complexity. The attack may be initiated remotely. The complexity of an attack is rather high. The exploitation is known to be difficult. The exploit has been disclosed to the public and may be used. Upgrading to version 3.2.2 is able to address this issue. The identifier of the patch is f7ea6817b90952baaea9baace2a3b4366fee6a63. It is recommended to upgrade the affected component.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "meteor"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "3.2.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-4727"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/meteor/meteor/issues/13713"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/meteor/meteor/pull/13721"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/meteor/meteor/commit/f7ea6817b90952baaea9baace2a3b4366fee6a63"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/meteor/meteor"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/meteor/meteor/releases/tag/release/METEOR%403.2.2"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/?ctiid.309029"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/?id.309029"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/?submit.570441"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-400" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-05-16T17:44:54Z",
    "nvd_published_at" : "2025-05-15T23:15:59Z"
  }
}