Home→Vulnerabilities→CVE-2026-6414
Disclosed

CVE-2026-6414

@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.

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Exploitation Probability (EPSS)

Low Priority
0.02%

The Exploit Prediction Scoring System (EPSS) uses machine learning to estimate the probability that a vulnerability will be exploited in the wild within the next 30 days.

0% (Theoretical)100% (Certainty)

7-Day Exploitation Trend

Vulnerability Timeline

2 events
Apr 16, 2026
Vulnerability Disclosed
Published to component-level vulnerability database.
Apr 23, 2026
Last Updated
Record updated with new analysis or tags.

Threat Actor Attribution

PREMIUM INTEL
Associated Groups:Lazarus Group, APT28
Ransomware Campaigns:LockBit 3.0, BlackCat
IoCs (Indicators):14 IPs, 3 Hashes

Remediation & Mitigation

SOLUTION

Official patches and mitigation steps are available for this vulnerability.

# Update Command
apt-get update && apt-get upgrade -y specific-package
# Verify installation
dpkg -l | grep package-name

Affected Products

1 Total
fastify/fastify-staticAll Versions

References

https://cna.openjsf.org/security-advisories.htmlOpenjsf
Third Party Advisory
https://github.com/fastify/fastify-static/security/advisories/GHSA-x428-ghpx-8j92GitHub
Vendor Advisory
https://github.com/fastify/middie/security/advisories/GHSA-cxrg-g7r8-w69pGitHub
Not Applicable
https://github.com/honojs/hono/security/advisories/GHSA-q5qw-h33p-qvwrGitHub
Not Applicable

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Check your domain or package.json for CVE-2026-6414 exposure.

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Vulnerability Details

CVSS Base Score
5.9/ 10
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Published Date
Apr 16, 2026
Last Modified
Apr 23, 2026
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