CVE-2026-27953ormar is a async mini ORM for Python.
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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
- 9.8 CRITICAL (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-20, CWE-915
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Jun 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
collerek ormar collerek:ormar | before 0.23.1 | NVD |
References
- https://github.com/ormar-orm/ormar/blob/master/examples/fastapi_quick_start.py#L55patch
- https://github.com/ormar-orm/ormar/blob/master/ormar/fields/foreign_key.py#L41patch
- https://github.com/ormar-orm/ormar/blob/master/ormar/models/helpers/pydantic.py#L108patch
- https://github.com/ormar-orm/ormar/blob/master/ormar/models/model.py#L89patch
- https://github.com/ormar-orm/ormar/blob/master/ormar/models/newbasemodel.py#L128patch
- https://github.com/ormar-orm/ormar/blob/master/ormar/models/newbasemodel.py#L292patch
- https://github.com/ormar-orm/ormar/commit/7f22aa21a7614b993970345b392dabb0ccde0ab3patch
- https://github.com/ormar-orm/ormar/releases/tag/0.23.1product, release-notes
- https://github.com/ormar-orm/ormar/security/advisories/GHSA-f964-whrq-44h8exploit, mitigation, vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.