THREAT OPS › Threat News › [NVD] CVE-2026-84469 (HIGH 7.5) — 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
[NVD] CVE-2026-84469 (HIGH 7.5) — 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
CVE-2026-84469 CVSS: 7.5 HIGH Published: 2026-09-04T10:17:13.677
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
MITRE ATT&CK techniques
- JavaScriptT1059.007
Indicators of compromise
- CVE-2026-84469cve
Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-84469