CVE-2026-27953

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Source
https://cve.org/CVERecord?id=CVE-2026-27953
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-27953.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-27953
Aliases
Downstream
Published
2026-03-19T20:23:06.379Z
Modified
2026-07-15T01:48:54.367341653Z
Severity
  • 7.1 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L CVSS Calculator
Summary
ormar has a Pydantic Validation Bypass via Kwargs Injection in Model Constructor
Details

ormar is a async mini ORM for Python. Versions 0.23.0 and below are vulnerable to Pydantic validation bypass through the model constructor, allowing any unauthenticated user to skip all field validation by injecting "pk_only": true into a JSON request body. By injecting "pk_only": true into a JSON request body, an unauthenticated attacker can skip all field validation and persist unvalidated data directly to the database. A secondary excluded parameter injection uses the same pattern to selectively nullify arbitrary model fields (e.g., email or role) during construction. This affects ormar's canonical FastAPI integration pattern recommended in its official documentation, enabling privilege escalation, data integrity violations, and business logic bypass in any application using ormar.Model directly as a request body parameter. This issue has been fixed in version 0.23.1.

Database specific 
{
    "cwe_ids": [
        "CWE-20",
        "CWE-915"
    ],
    "cna_assigner": "GitHub_M",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27953.json"
}
References

Affected packages

Git / github.com/ormar-orm/ormar

Affected ranges

Type
GIT
Repo
https://github.com/ormar-orm/ormar
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
7f22aa21a7614b993970345b392dabb0ccde0ab3
Database specific 
{
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "0.23.1"
        }
    ]
}

Affected versions

0.*
0.10.0
0.10.1
0.10.10
0.10.11
0.10.12
0.10.13
0.10.14
0.10.15
0.10.16
0.10.17
0.10.18
0.10.19
0.10.2
0.10.20
0.10.21
0.10.22
0.10.23
0.10.24
0.10.25
0.10.3
0.10.4
0.10.5
0.10.6
0.10.7
0.10.8
0.10.9
0.11.0
0.11.1
0.11.2
0.11.3
0.12.0
0.12.1
0.12.2
0.20.1
0.20.2
0.21.0
0.22.0
0.23.0
0.3.0
0.3.1
0.3.10
0.3.11
0.3.2
0.3.3
0.3.4
0.3.5
0.3.6
0.3.7
0.3.8
0.3.9
0.4.0
0.4.1
0.4.2
0.4.3
0.4.4
0.5.0
0.5.1
0.5.2
0.5.3
0.5.4
0.5.5
0.6.0
0.6.1
0.6.2
0.7.0
0.7.1
0.7.2
0.7.3
0.7.4
0.7.5
0.8.0
0.8.1
0.9.0
0.9.1
0.9.2
0.9.3
0.9.4
0.9.5
0.9.6
0.9.7
0.9.8
0.9.9

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-27953.json"