CVE-2026-33808
CriticalCVSS 9.1Summary
Wersje @fastify/express do 4.0.4 nie normalizują adresów URL przed przekazaniem ich do middleware Express, co umożliwia ominięcie autoryzacji w przypadku użycia opcji normalizacji routera Fastify. Atakujący może uzyskać dostęp do chronionych tras, manipulując ścieżką URL.
Risk Assessment
Organizacja narażona jest na nieautoryzowany dostęp do chronionych zasobów, co może prowadzić do wycieku danych lub innych poważnych incydentów bezpieczeństwa.
Recommendation
Zaleca się aktualizację do wersji @fastify/express 4.0.5 lub nowszej, aby usunąć tę podatność.
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Original NVD description (English source)
Impact@fastify/express v4.0.4 and earlier fails to normalize URLs before passing them to Express middleware when Fastify router normalization options are enabled. This allows complete bypass of path-scoped authentication middleware via duplicate slashes when ignoreDuplicateSlashes is enabled, or via semicolon delimiters when useSemicolonDelimiter is enabled. In both cases, Fastify router normalizes the URL and matches the route, but @fastify/express passes the original un-normalized URL to Express middleware, which fails to match and is skipped. An unauthenticated attacker can access protected routes by manipulating the URL path. PatchesUpgrade to @fastify/express v4.0.5 or later.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS