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CVE-2026-6414

@fastify/static vulnerable to route guard bypass via encoded path separators

Published: Apr 16, 2026Updated: Apr 16, 2026 Sources: CVE List NVD
NVD MITRE
5.9CVSS
MEDIUM

@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.

EPSS Score
N/A
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:HI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:NIntegrity
None
A:NAvailability
None

Weaknesses

CWE-177

Affected Products

@fastify/static
@fastify/static

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

References

https://github.com/fastify/middie/security/advisories/GHSA-cxrg-g7r8-w69p
github.com
https://github.com/honojs/hono/security/advisories/GHSA-q5qw-h33p-qvwr
github.com
https://github.com/fastify/fastify-static/security/advisories/GHSA-x428-ghpx-8j92
github.com
and 1 more references View all →

Timeline

Published
Apr 16, 2026
Last Updated
Apr 16, 2026

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