# CVE-2021-23518: node-cached-path-relative: The package cached-path-relative before 1.1.0 are vulnerable to Prototype Pollution via the cache variable that is se...

CVE-2021-23518 is fixed in node-cached-path-relative on 1 platform, first by DEBIAN-CVE-2021-23518, released January 21, 2022. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2021-23518
- Priority: Urgent
- CVSS: 9.8 (critical)
- EPSS: 0.0194
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jan 21, 2022

## Description

The package cached-path-relative before 1.1.0 are vulnerable to Prototype Pollution via the cache variable that is set as {} instead of Object.create(null) in the cachedPathRelative function, which allows access to the parent prototype properties when the object is used to create the cached relative path. When using the origin path as __proto__, the attribute of the object is accessed instead of a path. **Note:** This vulnerability derives from an incomplete fix in https://security.snyk.io/vuln/SNYK-JS-CACHEDPATHRELATIVE-72573

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | node-cached-path-relative Debian 12.15 (bookworm) | 1.1.0+~1.0.0-1 | [DEBIAN-CVE-2021-23518](https://patchblox.com/security/data/fix/linux/debian-cve-2021-23518.md) | Jan 21, 2022 |
| Linux | node-cached-path-relative Debian 13.5 (trixie) | 1.1.0+~1.0.0-1 | [DEBIAN-CVE-2021-23518](https://patchblox.com/security/data/fix/linux/debian-cve-2021-23518.md) | Jan 21, 2022 |
| Linux | node-cached-path-relative Debian 14 | 1.1.0+~1.0.0-1 | [DEBIAN-CVE-2021-23518](https://patchblox.com/security/data/fix/linux/debian-cve-2021-23518.md) | Jan 21, 2022 |

---

Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.