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Vulnerability · Published May 15, 2025 · Assigned by VulDB

CVE-2025-4727Meteor livedata_server.js Object.assign redos

Low 3.7

In plain English

A low-severity regular-expression denial of service in Meteor. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 61% of all known vulnerabilities).

Severity (CVSS 3.1)3.7Low
Exploit odds (30 days)0.9%top 39.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
npmmeteorno fix listedGHSA-j3v9-6gc7-vf5f

Affected products (as reported)

VendorProductVersions
n/a Meteor 3.2.03.2.1

Weakness: CWE-1333, CWE-400 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

References