Code injection in dataclasses-avroschema Pydantic field documentation
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-94.
Summary
dataclasses-avroschema versions from 0.65.9 before 0.70.6 insert a schema field's doc value into a generated pydantic.Field description without escaping it, which is a code injection flaw (CWE-94). A crafted quote ends the string and injects an expression that runs during generated class definition. A remote attacker can run arbitrary Python code when a user generates Pydantic or AvroDantic models from crafted documentation, which requires user interaction.
Written with Claude Haiku 5.5 from the sources below · 2026-10-27
Description from the CNA
dataclasses-avroschema generates Avro schemas from Python dataclasses, Pydantic models, and Faust Records and generates Python code from Avro schemas. From version 0.65.9 through 0.70.5, PydanticFieldRepresentation.add_field_properties inserts a schema field's doc value between the quotes of a generated pydantic.Field description argument without escaping it. A crafted quote can terminate the string and inject an expression evaluated during generated class definition, allowing arbitrary Python code execution for Pydantic and AvroDantic model generation. Version 0.70.6 fixes the vulnerability by escaping the documentation value before rendering it.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| marcosschroh | dataclasses-avroschema | 0.65.9 to before 0.70.6 | 0.70.6 | Patch available | CNA |
- dataclasses-avroschema Vendormarcosschroh Affected 0.65.9 to before 0.70.6 Fixed in 0.70.6 Patch available CNA
Remediation
Upgrade dataclasses-avroschema to version 0.70.6, which escapes the documentation value before rendering it.
Written with Claude Haiku 5.5 from the sources below · 2026-10-27
- Fix · CNA dataclasses-avroschema (marcosschroh) Fixed in 0.70.6
Timeline
- 2026-10-13 Threatist record created from CVE-2026-108380
References
Other 4
- https://github.com/marcosschroh/dataclasses-avroschema/security/advisories/GHSA-g7p7-mgvm-jw7p
- https://github.com/marcosschroh/dataclasses-avroschema/pull/843
- https://github.com/marcosschroh/dataclasses-avroschema/commit/429f3d705d2d04c0c65e2ef832daed5ff91318fc
- https://github.com/marcosschroh/dataclasses-avroschema/releases/tag/0.70.6
More marcosschroh vulnerabilities
- TI-2026-71971 Code injection in dataclasses-avroschema enum generation CVSS 3.1HIGH 8.8
- TI-2026-71968 Code injection in dataclasses-avroschema through enum symbol literals CVSS 3.1HIGH 8.8
- TI-2026-71967 Code injection in dataclasses-avroschema Pydantic model generation CVSS 3.1HIGH 8.8
- TI-2026-71964 Code injection in dataclasses-avroschema generated class docstrings CVSS 3.1HIGH 8.8
- TI-2026-71963 Code injection in dataclasses-avroschema through Meta.schema_name CVSS 3.1HIGH 8.8
- TI-2026-71962 Code injection in dataclasses-avroschema via Avro record names CVSS 3.1HIGH 8.8
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences