CVE-2021-23518: cached-path-relative_project cached-path-relative Prototype Pollution

Vulnerability summary

CVE-2021-23518 is a critical (CVSS 9.8) Prototype Pollution vulnerability in cached-path-relative_project cached-path-relative. EPSS estimates a 1.94% chance of exploitation in the next 30 days, higher than 79.8% of scored vulnerabilities. 2 public exploits are recorded.

Timeline

1. 21-01-2022
   PublishedVulnerability first disclosed.
2. 16-09-2024
   Last modifiedVulnerability information updated.

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

• CWE-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype.