{"cve":"CVE-2021-23509","nvd":{"published":"2021-11-03T18:15:08.073","modified":"2026-06-17T03:38:48.533","status":"Modified","description":"This affects the package json-ptr before 3.0.0. A type confusion vulnerability can lead to a bypass of CVE-2020-7766 when the user-provided keys used in the pointer parameter are arrays.","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-843"],"references":["https://github.com/flitbit/json-ptr%23security-vulnerabilities-resolved","https://github.com/flitbit/json-ptr/commit/5dc458fbad1c382a2e3ca6d62e66ede3d92849ca","https://github.com/flitbit/json-ptr/pull/42","https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1767165","https://snyk.io/vuln/SNYK-JS-JSONPTR-1577291"],"products":["json-ptr_project:json-ptr"],"source":"nvd","synced_at":"2026-10-19T21:24:39.218183596+00:00"},"epss":{"cve":"CVE-2021-23509","score":0.01828,"percentile":0.78844,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-8gwj-8hxc-285w","url":"https://osv.dev/vulnerability/GHSA-8gwj-8hxc-285w","summary":"Prototype Pollution in json-ptr","modified":"2025-01-14T09:12:03.022963Z","packages":[{"ecosystem":"npm","name":"json-ptr","purl":"pkg:npm/json-ptr","ranges":["<3.0.0"],"fixed":["3.0.0"]}]}],"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."]}