{"id":"UBUNTU-CVE-2021-23518","details":"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","modified":"2026-05-20T16:06:26.412196864Z","published":"2022-01-21T20:15:00Z","upstream":["CVE-2021-23518"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-23518"},{"type":"REPORT","url":"https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-2348246"},{"type":"REPORT","url":"https://github.com/ashaffer/cached-path-relative/commit/40c73bf70c58add5aec7d11e4f36b93d144bb760"},{"type":"REPORT","url":"https://snyk.io/vuln/SNYK-JS-CACHEDPATHRELATIVE-2342653"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-23518"}],"affected":[{"package":{"name":"node-cached-path-relative","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/node-cached-path-relative?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0.1-1"],"ecosystem_specific":{"binaries":[{"binary_name":"node-cached-path-relative","binary_version":"1.0.1-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-23518.json"}},{"package":{"name":"node-cached-path-relative","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/node-cached-path-relative?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0.2-1"],"ecosystem_specific":{"binaries":[{"binary_name":"node-cached-path-relative","binary_version":"1.0.2-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-23518.json"}},{"package":{"name":"node-cached-path-relative","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/node-cached-path-relative?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0.2-1","1.0.2-2","1.0.2-3","1.1.0+~1.0.0-1"],"ecosystem_specific":{"binaries":[{"binary_name":"node-cached-path-relative","binary_version":"1.1.0+~1.0.0-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-23518.json"}},{"package":{"name":"node-cached-path-relative","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/node-cached-path-relative?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.1.0+~1.0.0-3"],"ecosystem_specific":{"binaries":[{"binary_name":"node-cached-path-relative","binary_version":"1.1.0+~1.0.0-3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-23518.json"}},{"package":{"name":"node-cached-path-relative","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/node-cached-path-relative?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.1.0+~1.0.0-3"],"ecosystem_specific":{"binaries":[{"binary_name":"node-cached-path-relative","binary_version":"1.1.0+~1.0.0-3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-23518.json"}},{"package":{"name":"node-cached-path-relative","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/node-cached-path-relative?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.1.0+~1.0.0-3","1.1.0+~1.0.2-1"],"ecosystem_specific":{"binaries":[{"binary_name":"node-cached-path-relative","binary_version":"1.1.0+~1.0.2-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-23518.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"low"}]}