Impact: When 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. Unsafe examples: /*foo-*bar-:baz /*a-:b-*c-:d /x/*a-:b/*c/y Safe examples: /*foo-:bar /*foo-:bar-*baz Patches: Upgrade to version 8.4.0. Workarounds: If 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.
History

Thu, 16 Apr 2026 18:15:00 +0000

Type Values Removed Values Added
First Time appeared Pillarjs
Pillarjs path-to-regexp
CPEs cpe:2.3:a:pillarjs:path-to-regexp:*:*:*:*:*:node.js:*:*
Vendors & Products Pillarjs
Pillarjs path-to-regexp

Tue, 31 Mar 2026 03:00:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Fri, 27 Mar 2026 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 27 Mar 2026 08:45:00 +0000

Type Values Removed Values Added
First Time appeared Path-to-regexp
Path-to-regexp path-to-regexp
Vendors & Products Path-to-regexp
Path-to-regexp path-to-regexp

Thu, 26 Mar 2026 19:15:00 +0000

Type Values Removed Values Added
Description Impact: When 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. Unsafe examples: /*foo-*bar-:baz /*a-:b-*c-:d /x/*a-:b/*c/y Safe examples: /*foo-:bar /*foo-:bar-*baz Patches: Upgrade to version 8.4.0. Workarounds: If 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.
Title path-to-regexp vulnerable to Regular Expression Denial of Service via multiple wildcards
Weaknesses CWE-1333
References
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: openjs

Published: 2026-03-26T19:02:00.729Z

Updated: 2026-03-27T13:58:03.925Z

Reserved: 2026-03-26T18:05:44.717Z

Link: CVE-2026-4923

cve-icon Vulnrichment

Updated: 2026-03-27T13:46:51.745Z

cve-icon NVD

Status : Analyzed

Published: 2026-03-26T19:17:08.187

Modified: 2026-04-16T18:03:37.620

Link: CVE-2026-4923

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-03-26T19:02:00Z

Links: CVE-2026-4923 - Bugzilla