{"id":"CVE-2026-84469","revision":"b1d54776fcfe4cc48640b0cf3da32c0b","records":[{"revision":"b1d54776fcfe4cc48640b0cf3da32c0b","observedAt":"2026-10-25T16:19:16.24+00:00","statement":{"source":"nvd","id":"CVE-2026-84469","aliases":[],"title":"fastify versions before 5.12.2 decide whether to compile a request schema based on JavaScript truthiness, but JSON Schema Draft 7 defines the boolean false as a valid schema that rejects every instance. When an application assigns false to …","description":"fastify versions before 5.12.2 decide whether to compile a request schema based on JavaScript truthiness, but JSON Schema Draft 7 defines the boolean false as a valid schema that rejects every instance. When an application assigns false to a route's body, querystring, params, or headers schema to deny all input, fastify treats it as a missing schema, compiles no validator, and runs the route handler on any request. An unauthenticated remote client can therefore reach a handler that a valid deny-all schema was intended to make unreachable, a complete validation bypass that can lead to unauthorized state changes or execution of disabled operations. Users should upgrade to fastify 5.12.2 or later.","state":0,"publishedAt":"2026-09-04T10:17:13.677+00:00","modifiedAt":"2026-09-15T20:06:50.543+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · ce714d77-add3-4f53-aff5-83d477b104bb · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","score":7.5,"severity":"HIGH"}],"references":["https://cna.openjsf.org/security-advisories.html","https://github.com/fastify/fastify/security/advisories/GHSA-hwr6-493r-vm6h"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-84469","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-20"],"productCriteria":["cpe:2.3:a:fastify:fastify:*:*:*:*:*:node.js:*:*"],"sourceDates":{"published":"2026-09-04T10:17:13.677","lastModified":"2026-09-15T20:06:50.543"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-84469","identifiers":["CVE-2026-84469"]},"retained":false,"historicalAffected":[]}],"coverage":[]}