{"cve":"CVE-2017-16118","nvd":{"published":"2018-06-07T02:29:02.940","modified":"2026-06-17T01:08:49.727","status":"Modified","description":"The forwarded module is used by the Express.js framework to handle the X-Forwarded-For header. It is vulnerable to a regular expression denial of service when it's passed specially crafted input to parse. This causes the event loop to be blocked causing a denial of service condition.","cvss_v4":null,"cvss_v3":{"version":"3.0","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-400"],"references":["http://www.securityfocus.com/bid/104427","https://nodesecurity.io/advisories/527","http://www.securityfocus.com/bid/104427","https://nodesecurity.io/advisories/527"],"products":["forwarded_project:forwarded"],"source":"nvd","synced_at":"2026-10-19T20:50:40.212176939+00:00"},"epss":{"cve":"CVE-2017-16118","score":0.01853,"percentile":0.79155,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-mpcf-4gmh-23w8","url":"https://osv.dev/vulnerability/GHSA-mpcf-4gmh-23w8","summary":"Regular Expression Denial of Service in forwarded","modified":"2023-11-08T03:59:05.893181Z","packages":[{"ecosystem":"npm","name":"forwarded","purl":"pkg:npm/forwarded","ranges":["<0.1.2"],"fixed":["0.1.2"]}]}],"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."]}