CVE-2026-4867 is a Regular Expression Denial of Service (ReDoS) vulnerability in the path-to-regexp library, specifically affecting versions prior to 0.1.13. This flaw occurs when three or more parameters are used within a single segment, separated by non-period characters, causing catastrophic backtracking and application unresponsiveness. Rated High (CVSS 7.5), it can be exploited remotely without authentication to cause a denial of service. While there is no evidence of active exploitation, public exploit code, or KEV listing, the vulnerability has generated some community discussion. Patches involve upgrading to [email protected] or implementing specific custom regular expressions as workarounds.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 0.1.13CPE matchmatch criteria | cpe:2.3:a:pillarjs:path-to-regexp:*:*:*:*:*:node.js:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.