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@fastify/express has a middleware authentication bypass via URL normalization gaps (duplicate slashes and semicolons)

🗓️ 16 Apr 2026 01:03:46Reported by GitHub Advisory DatabaseType 
github
 github
🔗 github.com👁 5 Views

Auth bypass in @fastify/express 4.0.4 due to URL normalization gaps: duplicate slashes and semicolon delimiters.

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09 Jun 2026 10:47Current
5.9Medium risk
Vulners AI Score5.9
CVSS 3.19.1
CVSS 49.1
EPSS0.00483
SSVC
5