CVE-2026-84469

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Source
https://cve.org/CVERecord?id=CVE-2026-84469
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-84469.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-84469
Aliases
  • GHSA-hwr6-493r-vm6h
Published
2026-09-04T09:59:36Z
Modified
2026-09-10T03:30:50Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N CVSS Calculator
Summary
fastify vulnerable to request validation bypass via skipped boolean false schemas
Details

fastify versions before 5.12.2 decide whether to compile a request schema based on JavaScript truthiness, but JSON Schema Draft 7 defines the boolean false as a valid schema that rejects every instance. When an application assigns false to a route's body, querystring, params, or headers schema to deny all input, fastify treats it as a missing schema, compiles no validator, and runs the route handler on any request. An unauthenticated remote client can therefore reach a handler that a valid deny-all schema was intended to make unreachable, a complete validation bypass that can lead to unauthorized state changes or execution of disabled operations. Users should upgrade to fastify 5.12.2 or later.

Database specific 
{
    "cna_assigner": "openjs",
    "cwe_ids": [
        "CWE-20"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/84xxx/CVE-2026-84469.json"
}
References

Affected packages

Git / github.com/fastify/fastify

Affected ranges

Type
GIT
Repo
https://github.com/fastify/fastify
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
942a2be8704244db778f8db9a0bb4951b8825156
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "5.12.2"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "DESCRIPTION"
    ]
}

Affected versions

v0.*
v0.1.0
v0.10.0
v0.11.0
v0.11.1
v0.12.0
v0.13.0
v0.13.1
v0.14.0
v0.14.1
v0.15.0
v0.15.1
v0.15.2
v0.15.3
v0.16.0
v0.17.0
v0.18.0
v0.19.0
v0.19.1
v0.2.0
v0.20.0
v0.20.1
v0.21.0
v0.22.0
v0.23.0
v0.24.0
v0.25.0
v0.25.1
v0.25.2
v0.25.3
v0.26.0
v0.26.1
v0.26.2
v0.27.0
v0.28.0
v0.28.1
v0.28.2
v0.29.0
v0.29.1
v0.29.2
v0.3.0
v0.30.0
v0.30.1
v0.30.2
v0.30.3
v0.31.0
v0.32.0
v0.33.0
v0.34.0
v0.35.0
v0.35.1
v0.35.2
v0.35.3
v0.35.4
v0.35.5
v0.35.6
v0.35.7
v0.36.0
v0.37.0
v0.38.0
v0.39.0
v0.39.1
v0.4.0
v0.40.0
v0.41.0
v0.42.0
v0.43.0
v0.5.0
v0.6.0
v0.7.0
v0.7.1
v0.8.0
v0.9.0
v1.*
v1.0.0
v1.0.0-rc.1
v1.0.0-rc.2
v1.0.0-rc.3
v1.1.0
v1.1.1
v1.10.0
v1.11.0
v1.11.1
v1.11.2
v1.12.0
v1.12.1
v1.13.0
v1.2.0
v1.2.1
v1.3.0
v1.3.1
v1.4.0
v1.5.0
v1.6.0
v1.7.0
v1.8.0
v1.9.0
v2.*
v2.0.0
v2.0.0-rc.0
v2.0.0-rc.1
v2.0.0-rc.2
v2.0.0-rc.3
v2.0.0-rc.4
v2.0.0-rc.5
v2.0.0-rc.6
v2.0.1
v2.1.0
v2.14.0
v2.15.1
v2.2.0
v2.3.0
v3.*
v3.0.0
v3.0.0-alpha.1
v3.0.0-rc.1
v3.0.0-rc.2
v3.0.0-rc.3
v3.0.0-rc.4
v3.0.0-rc.5
v3.0.1
v3.0.2
v3.0.3
v3.1.0
v3.1.1
v3.10.0
v3.10.1
v3.11.0
v3.12.0
v3.13.0
v3.14.0
v3.14.1
v3.14.2
v3.15.0
v3.15.1
v3.16.0
v3.16.1
v3.16.2
v3.17.0
v3.18.0
v3.18.1
v3.19.0
v3.19.1
v3.19.2
v3.2.0
v3.2.1
v3.20.0
v3.20.1
v3.20.2
v3.21.0
v3.21.1
v3.21.2
v3.21.3
v3.21.4
v3.21.5
v3.21.6
v3.22.0
v3.22.1
v3.23.0
v3.23.1
v3.24.0
v3.24.1
v3.25.0
v3.25.1
v3.25.2
v3.25.3
v3.26.0
v3.27.0
v3.27.1
v3.27.2
v3.3.0
v3.4.0
v3.4.1
v3.5.0
v3.5.1
v3.6.0
v3.7.0
v3.8.0
v3.9.0
v3.9.1
v3.9.2
v4.*
v4.0.0
v4.0.0-alpha.1
v4.0.0-alpha.2
v4.0.0-alpha.3
v4.0.0-rc.1
v4.0.0-rc.2
v4.0.0-rc.3
v4.0.0-rc.4
v4.0.0-rc.5
v4.0.1
v4.0.2
v4.0.3
v4.1.0
v4.2.0
v4.2.1
v4.3.0
v4.4.0
v4.5.0
v4.5.1
v4.5.2
v5.*
v5.0.0
v5.0.0-alpha.1
v5.0.0-alpha.2
v5.0.0-alpha.4
v5.1.0
v5.10.0
v5.11.0
v5.11.1
v5.11.2
v5.11.3
v5.12.0
v5.12.1
v5.2.0
v5.2.1
v5.2.2
v5.3.0
v5.3.1
v5.3.2
v5.3.3
v5.4.0
v5.5.0
v5.6.0
v5.6.1
v5.6.2
v5.7.0
v5.7.1
v5.7.2
v5.7.3
v5.7.4
v5.8.0
v5.8.1
v5.8.2
v5.8.3
v5.8.4
v5.8.5
v5.9.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-84469.json"