CVE-2025-4727

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.

• CWE-400
• CWE-1333

• https://github.com/meteor/meteor/commit/f7ea6817b90952baaea9baace2a3b4366fee6a63Issue Tracking, Patch
• https://github.com/meteor/meteor/issues/13713Broken Link
• https://github.com/meteor/meteor/pull/13721Issue Tracking, Patch
• https://github.com/meteor/meteor/releases/tag/release/METEOR%403.2.2Release Notes
• https://vuldb.com/?ctiid.309029Permissions Required, VDB Entry
• https://vuldb.com/?id.309029Third Party Advisory, VDB Entry
• https://vuldb.com/?submit.570441Exploit, Third Party Advisory, VDB Entry
• https://vuldb.com/?submit.570441Exploit, Third Party Advisory, VDB Entry

Published

May 15, 2025

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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