{"id":"CVE-2021-3918","aliases":["GHSA-896r-f27r-55mw"],"url":"https://o3.security/vulnerability/CVE-2021-3918","summary":"json-schema is vulnerable to Prototype Pollution","details":"json-schema before version 0.4.0 is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution').","published":"2021-11-13T09:15:06.737Z","modified":"2026-10-20T10:54:53.805101612Z","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":{"score":0.0383,"percentile":0.8957,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"npm","name":"json-schema","fixedVersion":"0.4.0"}],"fix":{"url":"https://github.com/kriszyp/json-schema/commit/22f146111f541d9737e832823699ad3528ca7741","label":"kriszyp/json-schema@22f1461"},"references":[{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2022/12/msg00013.html"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20250117-0004/"},{"type":"FIX","url":"https://github.com/kriszyp/json-schema/commit/22f146111f541d9737e832823699ad3528ca7741"},{"type":"FIX","url":"https://huntr.dev/bounties/bb6ccd63-f505-4e3a-b55f-cd2662c261a9"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-3918"},{"type":"WEB","url":"https://github.com/kriszyp/json-schema/commit/b62f1da1ff5442f23443d6be6a92d00e65cba93a"},{"type":"WEB","url":"https://github.com/kriszyp/json-schema/commit/f6f6a3b02d667aa4ba2d5d50cc19208c4462abfa"},{"type":"PACKAGE","url":"https://github.com/kriszyp/json-schema"},{"type":"WEB","url":"https://security.netapp.com/advisory/ntap-20250117-0004"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-20T10:54:53.805101612Z"}}