Is CVE-2026-6414 in the CISA KEV catalog?

No. CVE-2026-6414 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-6414?

CVE-2026-6414 has a CVSS v3 base score of 5.9 (MEDIUM).

What is the EPSS score for CVE-2026-6414?

CVE-2026-6414 has an EPSS score of 0.40% (32th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-6414?

Upgrade fastify-static to 9.1.1 or later.

CVE & CISA-KEV Catalog

CVE-2026-6414

MEDIUM

5.9

CVSS v3

NVD

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.

CWE-177

How to fix

Remediation Available

fastify-staticNVD

Affected:>= 8.0.0, < 9.1.1Fixed in:9.1.1CVE-2026-6414derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

0.40%probability of exploitation in 30 days

32ndpercentile

Low risk: more likely to be exploited than 32% of all known CVEs.

References

Vendor Advisory1

github.com

Third-Party Advisory1

cna.openjsf.org

Other references2

Embed a live status badge for CVE-2026-6414

Markdown

[![CVE-2026-6414](https://tridentstack.com/cve/badge/CVE-2026-6414.svg)](https://tridentstack.com/cve/CVE-2026-6414)

HTML

<a href="https://tridentstack.com/cve/CVE-2026-6414"><img src="https://tridentstack.com/cve/badge/CVE-2026-6414.svg" alt="CVE-2026-6414"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-23.