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EUVD-2026-364083

fkie_cve-2026-84469

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.

GHSA-hwr6-493r-vm6h — fastify vulnerable to request validation bypass via skipped boolean false schemas

Affected: npm: fastify

### Impact

Fastify decided whether to validate a request part by checking its schema for JavaScript truthiness. JSON Schema Draft 7 defines the boolean `false` as a valid schema that rejects every instance, but because `false` is falsy, a route that set `body`, `querystring`, `params`, or `headers` to `false` had that part left uncompiled: no validator was attached and the request reached the handler. An application that used `false` as a deny-all schema to make a route unreachable was therefore fully bypassed, and an unauthenticated remote client could reach the handler with any input. The same applied to the documented `query` alias for `querystring`. This is a complete bypass rather than a weak-schema issue, since `false` is the strongest JSON Schema assertion and must always fail.

### Patches

Request-part schemas are now selected by an explicit presence check rather than truthiness, so a boolean `false` (or `true`) schema is compiled and enforced, including through the `query` alias. Patched in fastify `5.12.2`. The fix is also included in the `6.0.0` release.

### Workarounds

If upgrading is not immediately possible, express a deny-all request schema with an always-failing object schema instead of the boolean `false` (for example `{ "not": {} }`), or reject the request in an `onRequest` hook.

RHSA-2026:84734 — Red Hat Security Advisory: RHOAI 3.4.5 - Red Hat OpenShift AI

Cohere North AI: Cohere North AI: Arbitrary user information overwrite via incorrect access control Cohere North AI: Cohere North AI: Information disclosure via improper Origin header validation Cohere North AI: Cohere North AI: Information Leak via WebSocket Endpoint urllib3: urllib3 Streaming API improperly handles highly compressed data python-transformers: python-transformers: Arbitrary code execution due to overridden trust_remote_code setting fast-uri: fast-uri: URI authority bypass due to improper delimiter handling undici: undici: Information disclosure and data integrity issues due to incorrect Socks5ProxyAgent connection routing python-pip: Path traversal via malicious entry point name in pip wheel installation allows arbitrary file overwrite urllib3: urllib3: Denial of Service via decompression bomb bypass with Brotli support org.eclipse.parsson/parsson: Eclipse Parsson: Denial of Service via uncontrolled resource consumption in JSON parsing undici: undici: Man-in-the-Middle attack via ignored TLS options with SOCKS5 proxy jetty-security: Eclipse Jetty: Authentication bypass via Digest authentication encoding collision jetty: Eclipse Jetty: Information disclosure due to retained HTTP/1.1 trailers across connections sqlite: SQLite: Arbitrary code execution via crafted FTS5 full-text search data sqlite: SQLite: Arbitrary code execution and crash via heap-based buffer overflow in FTS5 form-data: form-data: Form field override via CRLF injection undici: undici: Denial…