CVE-2026-6414

MediumCVSS 5.9/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 5.9/10CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Weakness enumeration

CWE-177

Affected software

No affected versions have been published.

Timeline

Published
Apr 16, 2026
Last modified
Jun 17, 2026
NVD status
Analyzed

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CVE-2026-6414: Medium severity, CVSS 5.9 | Vulnix