CVE-2026-6270

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Source
https://cve.org/CVERecord?id=CVE-2026-6270
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-6270.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-6270
Aliases
Related
Published
2026-04-16T13:44:46.322Z
Modified
2026-07-08T08:14:42.262687365Z
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 middleware authentication bypass in child plugin scopes
Details

@fastify/middie versions 9.3.1 and earlier do not register inherited middleware directly on child plugin engine instances. When a Fastify application registers authentication middleware in a parent scope and then registers child plugins with @fastify/middie, the child scope does not inherit the parent middleware. This allows unauthenticated requests to reach routes defined in child plugin scopes, bypassing authentication and authorization checks. Upgrade to @fastify/middie 9.3.2 to fix this issue. There are no workarounds.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6270.json",
    "cna_assigner": "openjs",
    "cwe_ids": [
        "CWE-436"
    ]
}
References

Affected packages

Git / github.com/fastify/middie

Affected ranges

Type
GIT
Repo
https://github.com/fastify/middie
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
792d2f46ae68516d3122c9a4468a5748a34efb47
Database specific 
{
    "source": [
        "AFFECTED_FIELD",
        "CPE_RANGE"
    ],
    "cpe": "cpe:2.3:a:fastify:fastify\\/middie:*:*:*:*:*:node.js:*:*",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "9.3.2"
        }
    ]
}

Affected versions

v0.*
v0.2.0
v0.3.0
v1.*
v1.0.0
v1.1.0
v2.*
v2.0.0
v2.1.0
v2.1.1
v3.*
v3.0.0
v3.1.0
v3.2.0
v3.2.1
v4.*
v4.0.0
v4.0.1
v4.1.0
v5.*
v5.0.0
v5.1.0
v5.2.0
v5.3.0
v5.4.0
v6.*
v6.0.0
v7.*
v7.0.0
v8.*
v8.0.0
v8.1.0
v8.2.0
v8.3.0
v8.3.1
v9.*
v9.0.0
v9.0.1
v9.0.2
v9.0.3
v9.1.0
v9.2.0
v9.3.0
v9.3.1

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-6270.json"