{"cve":"CVE-2020-7770","nvd":{"published":"2020-11-12T11:15:11.870","modified":"2026-06-17T03:25:24.963","status":"Modified","description":"This affects the package json8 before 1.0.3. The function adds in the target object the property specified in the path, however it does not properly check the key being set, leading to a prototype pollution.","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/sonnyp/JSON8/commit/2e890261b66cbc54ae01d0c79c71b0fd18379e7e","https://snyk.io/vuln/SNYK-JS-JSON8-1017116","https://github.com/sonnyp/JSON8/commit/2e890261b66cbc54ae01d0c79c71b0fd18379e7e","https://snyk.io/vuln/SNYK-JS-JSON8-1017116"],"products":["json8_project:json8"],"source":"nvd","synced_at":"2026-10-19T21:11:20.317016139+00:00"},"epss":{"cve":"CVE-2020-7770","score":0.01893,"percentile":0.79601,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-7h43-gx24-p529","url":"https://osv.dev/vulnerability/GHSA-7h43-gx24-p529","summary":"Prototype pollution in json8","modified":"2026-07-08T06:49:42.512196386Z","packages":[{"ecosystem":"npm","name":"json8","purl":"pkg:npm/json8","ranges":["<1.0.3"],"fixed":["1.0.3"]}]}],"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."]}