{"id":"CVE-2022-21190","aliases":["GHSA-jjf5-wx3j-3fv7","SNYK-JS-CONVICT-2774757"],"url":"https://o3.security/vulnerability/CVE-2022-21190","summary":"Prototype Pollution","details":"This affects the package convict before 6.2.3. This is a bypass of [CVE-2022-22143](https://security.snyk.io/vuln/SNYK-JS-CONVICT-2340604). The [fix](https://github.com/mozilla/node-convict/commit/3b86be087d8f14681a9c889d45da7fe3ad9cd880) introduced, relies on the startsWith method and does not prevent the vulnerability: before splitting the path, it checks if it starts with __proto__ or this.constructor.prototype. To bypass this check it's possible to prepend the dangerous paths with any string value followed by a dot, like for example foo.__proto__ or foo.this.constructor.prototype.","published":"2022-05-13T20:00:38.749Z","modified":"2026-08-12T03:51:33.938700018Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":{"score":0.03913,"percentile":0.89538,"asOf":"2026-08-23"},"cisaKev":null,"exploitsKnown":2,"affectedPackages":[{"ecosystem":"npm","name":"convict","fixedVersion":"6.2.3"}],"fix":{"url":"https://github.com/mozilla/node-convict/commit/1ea0ab19c5208f66509e1c43b0d0f21c1fd29b75","label":"mozilla/node-convict@1ea0ab1"},"references":[{"type":"WEB","url":"https://gist.github.com/dellalibera/cebce20e51410acebff1f46afdc89808"},{"type":"WEB","url":"https://github.com/mozilla/node-convict/blob/3b86be087d8f14681a9c889d45da7fe3ad9cd880/packages/convict/src/main.js%23L571"},{"type":"WEB","url":"https://github.com/mozilla/node-convict/blob/master/CHANGELOG.md%23623---2022-05-07"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/21xxx/CVE-2022-21190.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-21190"},{"type":"ADVISORY","url":"https://snyk.io/vuln/SNYK-JS-CONVICT-2774757"},{"type":"FIX","url":"https://github.com/mozilla/node-convict/commit/1ea0ab19c5208f66509e1c43b0d0f21c1fd29b75"},{"type":"PACKAGE","url":"https://github.com/mozilla/node-convict"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:33.938700018Z"}}