{"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 is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')","published":"2021-11-13T09:15:06.737Z","modified":"2026-07-08T06:03:32.940297250Z","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":0.03563,"percentile":0.88441,"asOf":"2026-08-24"},"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"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T06:03:32.940297250Z"}}