{"action":"Upgrade fastify to 5.12.2 or later.","affected":[{"fixed":"5.12.2","introduced":"4.0.0"}],"component":"fastify","cve_ids":["CVE-2026-76169"],"ecosystem":"npm","epss":0.0053,"exploited":false,"fixed_versions":["5.12.2"],"ghsa_id":"GHSA-p68q-wchp-6fh7","id":"tcs_01M5KG2PJEWFD67XKPNTZ4T0PX","modified_at":"2026-10-01T00:00:05.665955465Z","published_at":"2026-09-30T23:45:34Z","references":["https://osv.dev/vulnerability/GHSA-p68q-wchp-6fh7","https://github.com/fastify/fastify/security/advisories/GHSA-p68q-wchp-6fh7","https://nvd.nist.gov/vuln/detail/CVE-2026-76169","https://github.com/fastify/fastify/commit/93c239a380f3f2778bb7565fcdf777e91cfe1fbc","https://cna.openjsf.org/security-advisories.html","https://github.com/fastify/fastify","https://github.com/fastify/fastify/releases/tag/v5.12.2"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"GHSA-p68q-wchp-6fh7","url":"https://osv.dev/vulnerability/GHSA-p68q-wchp-6fh7"}],"summary":"fastify vulnerable to authentication bypass via malformed URLs reaching encapsulated not-found handlers"}