{"cve":"CVE-2025-4727","nvd":{"published":"2025-05-15T23:15:59.470","modified":"2026-06-17T09:33:52.703","status":"Analyzed","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.","cvss_v4":{"vector":"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","score":6.3},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","score":3.7},"cwes":["CWE-400","CWE-1333"],"references":["https://github.com/meteor/meteor/commit/f7ea6817b90952baaea9baace2a3b4366fee6a63","https://github.com/meteor/meteor/issues/13713","https://github.com/meteor/meteor/pull/13721","https://github.com/meteor/meteor/releases/tag/release/METEOR%403.2.2","https://vuldb.com/?ctiid.309029"],"products":["meteor:meteor"],"source":"nvd","synced_at":"2026-10-19T22:01:57.636215869+00:00"},"epss":{"cve":"CVE-2025-4727","score":0.00922,"percentile":0.60367,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-j3v9-6gc7-vf5f","url":"https://osv.dev/vulnerability/GHSA-j3v9-6gc7-vf5f","summary":"Meteor Affected By Inefficient Regular Expression Complexity","modified":"2025-05-16T18:43:45.169817Z","packages":[{"ecosystem":"npm","name":"meteor","purl":"pkg:npm/meteor","ranges":["<=3.2.1"],"fixed":[]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}