CVE-2026-85184

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Source
https://cve.org/CVERecord?id=CVE-2026-85184
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-85184.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-85184
Aliases
  • GHSA-hx87-8wv7-pjv8
Published
2026-09-04T09:15:51Z
Modified
2026-09-17T03:47:22Z
Severity
  • 9.1 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
Summary
@fastify/middie vulnerable to path-scoped middleware bypass via absolute-form request target
Details

@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.

Database specific 
{
    "cna_assigner":  "openjs",
    "cwe_ids":  [
        "CWE-436"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85184.json"
}
References

Affected packages

Git / github.com/fastify/middie

Affected ranges

Type
GIT
Repo
https://github.com/fastify/middie
Events
Introduced
8de54e35035cefa5ca13fd9f06c7b38185038a0e
Fixed
310c7ef480bf1db2508316db7a42fdf274e6802e
Database specific
Show details 
{
    "cpe":  "cpe:2.3:a:fastify:fastify\\/middie:*:*:*:*:*:node.js:*:*",
    "extracted_events":  [
        {
            "introduced":  "9.1.0"
        },
        {
            "fixed":  "9.3.4"
        }
    ],
    "source":  [
        "AFFECTED_FIELD",
        "CPE_RANGE"
    ]
}

Affected versions

v9.*
v9.1.0
v9.2.0
v9.3.0
v9.3.1
v9.3.2
v9.3.3

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-85184.json"