{"action":"Upgrade fastify-reply-from to 4.0.2 or later.","affected":[{"fixed":"4.0.2","introduced":"0"}],"component":"fastify-reply-from","cve_ids":["CVE-2021-21321"],"ecosystem":"npm","epss":0.01821,"exploited":false,"fixed_versions":["4.0.2"],"ghsa_id":"GHSA-qmw8-3v4g-gwj4","id":"tcs_01M5KG6M7ZY1R7ZM1KPRCARWVA","modified_at":"2026-07-08T06:29:17.757441041Z","published_at":"2021-03-03T01:52:05Z","references":["https://osv.dev/vulnerability/GHSA-qmw8-3v4g-gwj4","https://github.com/fastify/fastify-reply-from/security/advisories/GHSA-qmw8-3v4g-gwj4","https://nvd.nist.gov/vuln/detail/CVE-2021-21321","https://github.com/fastify/fastify-reply-from/commit/dea227dda606900cc01870d08541b4dcc69d3889","https://www.npmjs.com/package/fastify-reply-from"],"severity":{"label":"critical","score":10},"sources":[{"source":"osv","source_id":"GHSA-qmw8-3v4g-gwj4","url":"https://osv.dev/vulnerability/GHSA-qmw8-3v4g-gwj4"}],"summary":"Prefix escape"}