# CVE-2026-4867: pillarjs path-to-regexp ReDoS via multiple route parameters

Source: https://junglewise.ai/threats/cve-2026-4867-pillarjs-path-to-regexp-redos-via-multiple-route-parameters  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-03-27  
License: CC BY 4.0 with a link back

CVE-2026-4867 · Severity: low · CVSS 3.1 · Published 2026-03-27

path-to-regexp is vulnerable to Regular Expression Denial of Service (ReDoS) when three or more parameters are used within a single URL segment.

Technologies: [path-to-regexp (npm)](https://junglewise.ai/threats/technologies/path-to-regexp). Vendors: [npm](https://junglewise.ai/threats/vendors/npm).

## Quick answers

**Is CVE-2026-4867 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-4867 being exploited in the wild.

**How severe is CVE-2026-4867?** Low severity, with a CVSS score of 3.1, published 27 March 2026.

**Which products and versions are affected?** path-to-regexp (npm) SEMVER:introduced=0,fixed=0.1.13.

**Is there a fix for CVE-2026-4867?** Yes. path-to-regexp (npm): upgrade to 0.1.13 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2026-4867?** Check whether you run path-to-regexp (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- path-to-regexp (npm): upgrade to 0.1.13 or later

  ```sh
  npm install path-to-regexp@0.1.13
  ```


## Affected products

- path-to-regexp (npm) SEMVER:introduced=0,fixed=0.1.13

## Identifiers

- CVE-2026-4867
- GHSA-37ch-88jc-xwx2

## Related threats

- [path-to-regexp regular expression denial of service via multiple wildcards](https://junglewise.ai/threats/cve-2026-4923-pillarjs-path-to-regexp-redos-via-multiple-wildcards)
- [path-to-regexp denial of service via sequential optional groups](https://junglewise.ai/threats/cve-2026-4926-path-to-regexp-denial-of-service-via-sequential-optional-groups)
- [path-to-regexp ReDoS vulnerability](https://junglewise.ai/threats/cve-2024-52798-path-to-regexp-redos-vulnerability)
- [path-to-regexp ReDoS via backtracking regular expressions](https://junglewise.ai/threats/cve-2024-45296-path-to-regexp-redos-via-backtracking-regular-expressions)