{"cve":"CVE-2026-4923","nvd":{"published":"2026-03-26T19:17:08.187","modified":"2026-06-17T10:57:27.740","status":"Analyzed","description":"Impact:\n\nWhen using multiple wildcards, combined with at least one parameter, a regular expression can be generated that is vulnerable to ReDoS. This backtracking vulnerability requires the second wildcard to be somewhere other than the end of the path.\n\nUnsafe examples:\n\n/*foo-*bar-:baz\n/*a-:b-*c-:d\n/x/*a-:b/*c/y\n\nSafe examples:\n\n/*foo-:bar\n/*foo-:bar-*baz\n\nPatches:\n\nUpgrade to version 8.4.0.\n\nWorkarounds:\n\nIf you are using multiple wildcard parameters, you can check the regex output with a tool such as https://makenowjust-labs.github.io/recheck/playground/ to confirm whether a path is vulnerable.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","score":5.9},"cwes":["CWE-1333"],"references":["https://cna.openjsf.org/security-advisories.html"],"products":["pillarjs:path-to-regexp"],"source":"nvd","synced_at":"2026-10-19T22:28:18.033120106+00:00"},"epss":{"cve":"CVE-2026-4923","score":0.00359,"percentile":0.297,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-27v5-c462-wpq7","url":"https://osv.dev/vulnerability/GHSA-27v5-c462-wpq7","summary":"path-to-regexp vulnerable to Regular Expression Denial of Service via multiple wildcards","modified":"2026-09-10T03:50:36.174856756Z","packages":[{"ecosystem":"npm","name":"path-to-regexp","purl":"pkg:npm/path-to-regexp","ranges":[">=8.0.0 <8.4.0"],"fixed":["8.4.0"]}]}],"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."]}