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CVE-2026-27953

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

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 7.1 · High · EPSS 1.2% · Fix available

Published
Updated

Stack: system · python

Affected products and versions

  • ormar

    Versions
    • < 0.23.1: Affected

    No fix published

  • ormar Debian:12

    Versions
    • 0.12.0-3
    • 0.12.2-1
    • 0.20.2-1
    • 0.21.0-1
    • 0.22.0-1
    • 0.23.0-1
    • 0.23.1-1
    • 0.24.0-1
    • 0.24.0-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • ormar Debian:14

    Versions
    • 0.11.2-1
    • 0.11.2-2
    • 0.11.2-3
    • 0.11.3-1
    • 0.12.0-1
    • 0.12.0-2
    • 0.12.0-3
    • 0.12.2-1
    • 0.20.2-1
    • 0.21.0-1
    • 0.22.0-1
    • 0.23.0-1
    Affected ranges
    • ECOSYSTEM: < 0.23.1-1

    Update to 0.23.1-1

  • ormar PyPI

    Versions
    • 0.1.0
    • 0.1.1
    • 0.1.2
    • 0.1.3
    • 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
    • 0.12.3
    • 0.2.1
    • 0.2.2
    • 0.20.0
    • 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
    Affected ranges
    • ECOSYSTEM: < 0.23.1

    Update to 0.23.1

  • ormar Ubuntu:24.04:LTS

    Versions
    • 0.12.0-3
    • 0.12.2-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • ormar Ubuntu:25.10

    Versions
    • 0.12.2-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • ormar Ubuntu:26.10

    Versions
    • 0.22.0-1
    • 0.24.0-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • ormar Ubuntu:26.04:LTS

    Versions
    • 0.12.2-1
    • 0.20.2-1
    • 0.21.0-1
    • 0.22.0-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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