Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2026-4923

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
26/03/2026
Last modified:
16/04/2026

Description

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

Impact

Vector 3.x
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 5.90 MEDIUM
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x
5.90
Severity 3.x
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:a:pillarjs:path-to-regexp:*:*:*:*:*:node.js:*:* 8.0.0 (including) 8.4.0 (excluding)

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools