{"action":"Upgrade elysia to 1.4.17 or later.","affected":[{"fixed":"1.4.17","introduced":"1.4.0"}],"component":"elysia","cve_ids":["CVE-2025-66456"],"ecosystem":"npm","epss":0.0056,"exploited":false,"fixed_versions":["1.4.17"],"ghsa_id":"GHSA-hxj9-33pp-j2cc","id":"tcs_01M5KFWFKGE4MANNKH8HYPAWAV","modified_at":"2026-02-04T03:31:17.532002Z","published_at":"2025-12-09T17:11:53Z","references":["https://osv.dev/vulnerability/GHSA-hxj9-33pp-j2cc","https://github.com/elysiajs/elysia/security/advisories/GHSA-8vch-m3f4-q8jf","https://github.com/elysiajs/elysia/security/advisories/GHSA-hxj9-33pp-j2cc","https://nvd.nist.gov/vuln/detail/CVE-2025-66456","https://github.com/elysiajs/elysia/pull/1564","https://github.com/elysiajs/elysia/commit/26935bf76ebc43b4a43d48b173fc853de43bb51e","https://github.com/elysiajs/elysia/commit/3af978663e437dccc6c1a2a3aff4b74e1574849e","https://github.com/elysiajs/elysia","https://github.com/sportshead/elysia-poc"],"severity":{"label":"critical","score":9.8},"sources":[{"source":"osv","source_id":"GHSA-hxj9-33pp-j2cc","url":"https://osv.dev/vulnerability/GHSA-hxj9-33pp-j2cc"},{"source":"nvd","source_id":"CVE-2025-66456","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-66456"}],"summary":"Elysia vulnerable to prototype pollution with multiple standalone schema validation"}