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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-27953 Detail

Description

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://github.com/ormar-orm/ormar/blob/master/examples/fastapi_quick_start.py#L55 GitHub, Inc.
https://github.com/ormar-orm/ormar/blob/master/ormar/fields/foreign_key.py#L41 GitHub, Inc.
https://github.com/ormar-orm/ormar/blob/master/ormar/models/helpers/pydantic.py#L108 GitHub, Inc.
https://github.com/ormar-orm/ormar/blob/master/ormar/models/model.py#L89 GitHub, Inc.
https://github.com/ormar-orm/ormar/blob/master/ormar/models/newbasemodel.py#L128 GitHub, Inc.
https://github.com/ormar-orm/ormar/blob/master/ormar/models/newbasemodel.py#L292 GitHub, Inc.
https://github.com/ormar-orm/ormar/commit/7f22aa21a7614b993970345b392dabb0ccde0ab3 GitHub, Inc.
https://github.com/ormar-orm/ormar/releases/tag/0.23.1 GitHub, Inc.
https://github.com/ormar-orm/ormar/security/advisories/GHSA-f964-whrq-44h8 GitHub, Inc.

Weakness Enumeration

CWE-ID CWE Name Source
CWE-20 Improper Input Validation GitHub, Inc.  
CWE-915 Improperly Controlled Modification of Dynamically-Determined Object Attributes GitHub, Inc.  

Change History

1 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-27953
NVD Published Date:
03/19/2026
NVD Last Modified:
03/19/2026
Source:
GitHub, Inc.