Go to homepageCyberStrike

Menu

Star on GitHub · 3.5k
Sign inDownload

CVE-2026-85184

9.1 · CRITICAL

@fastify/middie versions >= 9.1.0 and before 9.3.4 decide whether to run path-scoped middleware by matching against the raw request target, while the Fastify router resolves an absolute-form reques…

Published Sep 4, 2026fastifyCWE-436EPSS 0.52%

Overview

CVE-2026-85184 is a critical-severity vulnerability affecting fastify fastify\/middie. It was published on September 4, 2026 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

@fastify/middie versions >= 9.1.0 and before 9.3.4 decide whether to run path-scoped middleware by matching against the raw request target, while the Fastify router resolves an absolute-form request target to its path before dispatching. Because the two layers evaluate different strings, a request using an absolute-form target reaches the route handler while the path-scoped middleware, such as authentication or authorization, is skipped. An unauthenticated network attacker can use this to bypass path-based access controls in a Fastify application that relies on middie for those controls. Users should upgrade to @fastify/middie 9.3.4 or later.

Remediation

Check the references section for vendor advisories and patches from fastify. Update fastify\/middie to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
fastifyfastify\/middie>= 9.1.0, < 9.3.4Affected

References

Refcna.openjsf.org/security-advisories.htmlGitHubgithub.com/fastify/middie/security/advisories/GHSA-hx87-8wv7-pjv8

How CyberStrike helps

Frequently asked questions

What is CVE-2026-85184?

CVE-2026-85184 is a critical-severity vulnerability affecting fastify fastify\/middie. It was published on September 4, 2026 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

How severe is CVE-2026-85184?

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-85184?

Check the references section for vendor advisories and patches from fastify. Update fastify\/middie to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-85184?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-85184 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

Related CRITICAL CVEs from 2026

View all
Browse by year2026202520242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999
CyberStrike v2 is here — more intelligence, greater reach