CVE-2026-6414: medium-severity vulnerability in @fastify/static
@fastify/static vulnerable to route guard bypass via encoded path separators
Published
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13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.9epss 0.4%
@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.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Affected products
@fastify/static · @fastify/staticRelated CVEs — @fastify/static
In the same product, most dangerous first.
CVE-2026-15074HIGH@fastify/static vulnerable to route guard bypass via path traversalEPSS 0.7%CVE-2026-18427HIGH@fastify/static vulnerable to route guard bypass via non-canonical path segmentsEPSS 0.7%CVE-2026-90982MEDIUM@fastify/static vulnerable to route guard bypass via path case-foldingEPSS 0.6%CVE-2026-6410MEDIUM@fastify/static vulnerable to path traversal in directory listingEPSS 0.5%CVE-2026-7120MEDIUM@fastify/static vulnerable to Authorization Bypass via Non-Canonical URL PathsEPSS 0.4%