{"id":"CVE-2021-21322","details":"fastify-http-proxy is an npm package which is a fastify plugin for proxying your http requests to another server, with hooks. By crafting a specific URL, it is possible to escape the prefix of the proxied backend service. If the base url of the proxied server is `/pub/`, a user expect that accessing `/priv` on the target service would not be possible. In affected versions, it is possible. This is fixed in version 4.3.1.","aliases":["GHSA-c4qr-gmr9-v23w"],"modified":"2026-03-13T22:00:03.263168Z","published":"2021-03-02T04:15:12.597Z","related":["GHSA-c4qr-gmr9-v23w"],"references":[{"type":"ADVISORY","url":"https://github.com/fastify/fastify-http-proxy/security/advisories/GHSA-c4qr-gmr9-v23w"},{"type":"ADVISORY","url":"https://www.npmjs.com/package/fastify-http-proxy"},{"type":"FIX","url":"https://github.com/fastify/fastify-http-proxy/commit/02d9b43c770aa16bc44470edecfaeb7c17985016"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/fastify/fastify-http-proxy","events":[{"introduced":"0"},{"fixed":"33dba25c32af41beafc3cbb7139e2708bfda26db"},{"fixed":"02d9b43c770aa16bc44470edecfaeb7c17985016"}],"database_specific":{"versions":[{"introduced":"0"},{"fixed":"4.3.1"}]}}],"versions":["v0.1.1","v0.2.0","v0.2.1","v0.3.0","v0.4.0","v0.4.1","v0.4.2","v0.4.3","v0.6.0","v0.7.0","v0.8.0","v1.0.0","v2.0.1","v2.0.2","v2.0.3","v2.1.0","v2.2.0","v2.3.0","v3.0.0","v3.1.0","v3.2.0","v4.0.0","v4.0.1","v4.0.2","v4.0.3","v4.0.4","v4.1.0","v4.2.0","v4.3.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-21322.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}