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CVE-2026-27953— ormar has a Pydantic Validation Bypass via Kwargs Injection in Model Constructor

Quick assessment

Affected
ormar-orm ormar
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ormar是collerek个人开发者的一个Python的ORM库。 ormar 0.23.0及之前版本存在安全漏洞，该漏洞源于模型构造器存在Pydantic验证绕过，可能导致未经验证的用户通过向JSON请求体中注入__pk_only__: true来跳过所有字段验证，从而将未经验证的数据直接持久化到数据库，造成权限提升、数据完整性破坏和业务逻辑绕过。

CVSS 7.1 · High EPSS 1.17% · P67

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-27953

Vulnerability Information
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Vulnerability Title
ormar has a Pydantic Validation Bypass via Kwargs Injection in Model Constructor
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-915
Source: CVE Program / CVE List V5
Vulnerability Title
ormar 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ormar是collerek个人开发者的一个Python的ORM库。 ormar 0.23.0及之前版本存在安全漏洞，该漏洞源于模型构造器存在Pydantic验证绕过，可能导致未经验证的用户通过向JSON请求体中注入__pk_only__: true来跳过所有字段验证，从而将未经验证的数据直接持久化到数据库，造成权限提升、数据完整性破坏和业务逻辑绕过。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ormar-orm ormar < 0.23.1 -

II. Public POCs for CVE-2026-27953

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 10612 chars
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III. Intelligence Information for CVE-2026-27953

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Patches & Fixes for CVE-2026-27953 (6)

Vendor Advisories for CVE-2026-27953 (1)

Vendor Pages for CVE-2026-27953 (1)

Other References for CVE-2026-27953 (1)

IV. Related Vulnerabilities

Same product: ormar
Same weakness: CWE-915

V. Comments for CVE-2026-27953

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