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EUVD-2026-363886

fkie_cve-2026-84428

fastify versions before 5.12.2 implement the case-insensitive nature of HTTP header names by lowercasing names in a route's header schema before compiling it, but the transformation is incomplete: it lowercases the properties keys and the root-level required array, and does not lowercase the trigger and dependent names inside the JSON Schema Draft 7 dependencies keyword. Because Node stores request header names in lowercase, a canonical-case dependency such as requiring an authentication header whenever a privileged-mode header is present never matches, and the presence assertion is silently skipped. An unauthenticated remote client can therefore send the header that activates a privileged branch while omitting the header the dependency was meant to require, bypassing the conditional check. Users should upgrade to fastify 5.12.2 or later.

GHSA-9q9j-q6p8-xq58 — fastify vulnerable to header validation bypass via incomplete schema case normalization

Affected: npm: fastify

### Impact

Fastify lowercases header-schema property names before compiling the schema, because Node.js stores request header names in lowercase. That normalization was incomplete: it lowercased only top-level `properties` keys and the root `required` array, and did not lowercase the JSON Schema Draft 7 `dependencies` keyword (its trigger keys and dependent property names) or names in nested subschemas. As a result, a header schema that uses `dependencies` to require one header when another is present (for example `X-Admin` requiring `X-Admin-Token`) never matches the lowercased request headers, so the dependency assertion is silently skipped. An unauthenticated remote client can send the header that activates a privileged path while omitting the header the dependency was meant to require, bypassing a schema-enforced security control. The header schema is idiomatic, valid JSON Schema Draft 7, and no custom validator, malformed request, or misconfiguration is required.

### Patches

Header-schema names are now normalized across all schema positions (`properties`, `required`, `dependencies`, `dependentRequired`, `dependentSchemas`, and nested subschemas). Patched in fastify `5.12.2`. The fix is also included in the `6.0.0` release. Header schemas referenced through an external shared `$ref` (registered with `addSchema`) are not reached by this normalization and now emit an `FSTSEC002` startup warning; inline the header schema to keep case-insensitive assertions in effect.

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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…