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Threatist priority CRITICAL 0 HIGH 2 MEDIUM 0 LOW 0

Signals Exploited in the wild (KEV) 0 Patch available 2 No fix listed 0 Has CVE 2

Fix status Fixed 2 Partial 0 Will not fix 0 Deferred 0 No fix listed 0

Attack vector Network 2 Adjacent network 0 Local 0 Physical 0

Requirements No authentication 2 No user interaction 2

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Weakness (CWE) CWE-436 Interpretation Conflict 2

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Release: fastify @fastify/express 4.0.5 × Clear all filters

TI-2026-26179 CVE-2026-33807 · GHSA-hrwm-hgmj-7p9c

@fastify/express vulnerable to middleware path doubling causing authentication bypass in child plugin scopes

Priority HIGH 80

@fastify/express v4.0.4 and earlier contains a path handling bug in the onRegister function that causes middleware paths to be doubled when inherited by child plugins.

CVSS 3.1CRITICAL 9.1· Network · No auth · No interaction · EPSS 0.0043 · Published 2026-04-15 · Fixed in 4.0.5 CWE-436

TI-2026-26180 CVE-2026-33808 · GHSA-6hw5-45gm-fj88

@fastify/express vulnerable to middleware authentication bypass via URL normalization…

Priority HIGH 80

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.

CVSS 4.0CRITICAL 9.1· Network · No auth · No interaction · EPSS 0.00483 · Published 2026-04-15 · Fixed in 4.0.5 CWE-436

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