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BDVDB
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Vulnerabilities

CVE-2026-6414 | BDVDB-2026-327385 Detail

@fastify/static@fastify/static

Description#

@fastify/static versions 8.0.0 through 9.1.0 decode percent-encoded path separators (%2F) before filesystem resolution, while Fastify's router treats them as literal characters. This mismatch allows attackers to bypass route-based middleware or guards that protect files served by @fastify/static. For example, a route guard on a protected path can be circumvented by encoding the path separator in the URL. Upgrade to @fastify/static 9.1.1 to fix this issue. There are no workarounds.

Impact#

Per CVSS v3.1: confidentiality impact high, integrity impact none, availability impact none. Attack vector: network.

Weaknesses#

  • CWE-177 Improper Handling of URL Encoding (Hex Encoding)

References#

Exploit#

No public exploit known

History#

  1. Version 1Record published in the CVE List.