{"cve":"CVE-2021-23426","nvd":{"published":"2021-09-01T15:15:08.373","modified":"2026-06-17T03:38:44.507","status":"Modified","description":"This affects all versions of package Proto. It is possible to inject pollute the object property of an application using Proto by leveraging the merge function.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","score":7.5},"cwes":[],"references":["https://snyk.io/vuln/SNYK-JS-PROTO-1316301","https://www.npmjs.com/package/Proto","https://snyk.io/vuln/SNYK-JS-PROTO-1316301","https://www.npmjs.com/package/Proto"],"products":["proto_project:proto"],"source":"nvd","synced_at":"2026-10-19T21:21:57.125947417+00:00"},"epss":{"cve":"CVE-2021-23426","score":0.00861,"percentile":0.58552,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-58g2-9fqr-36q2","url":"https://osv.dev/vulnerability/GHSA-58g2-9fqr-36q2","summary":"Prototype Pollution in Proto","modified":"2023-11-08T04:05:08.991420Z","packages":[{"ecosystem":"npm","name":"Proto","purl":"pkg:npm/Proto","ranges":["<=1.1.4"],"fixed":[]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}