{"cve":"CVE-2021-23568","nvd":{"published":"2022-01-10T14:10:17.043","modified":"2026-06-17T03:38:50.067","status":"Modified","description":"The package extend2 before 1.0.1 are vulnerable to Prototype Pollution via the extend function due to unsafe recursive merge.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-1321"],"references":["https://github.com/eggjs/extend2/blob/master/index.js%23L50-L60","https://github.com/eggjs/extend2/commit/aa332a59116c8398976434b57ea477c6823054f8","https://github.com/eggjs/extend2/pull/2","https://snyk.io/vuln/SNYK-JS-EXTEND2-2320315","https://github.com/eggjs/extend2/blob/master/index.js%23L50-L60"],"products":["eggjs:extend2"],"source":"nvd","synced_at":"2026-10-19T21:26:33.761856376+00:00"},"epss":{"cve":"CVE-2021-23568","score":0.01498,"percentile":0.74233,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-gjm5-83cw-p3p2","url":"https://osv.dev/vulnerability/GHSA-gjm5-83cw-p3p2","summary":"Prototype Pollution in extend2","modified":"2026-09-10T03:49:27.701468105Z","packages":[{"ecosystem":"npm","name":"extend2","purl":"pkg:npm/extend2","ranges":["<1.0.1"],"fixed":["1.0.1"]}]}],"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."]}