What’s Vulnerable › Vulnerabilities

CVE-2026-108375: dataclasses-avroschema allows code injection through generated field-default literals

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-13 · updated 2026-10-16
• Weakness: CWE-94

Description

dataclasses-avroschema generates Avro schemas from Python dataclasses, Pydantic models, and Faust Records and generates Python code from Avro schemas. From version 0.38.0 through 0.70.5, FieldRepresentation.get_field_default inserts schema-controlled string, UUID, bytes, and fixed field defaults into quoted literals in generated Python source without escaping them. A crafted default can terminate the literal and inject statements into the generated module, which execute when the module is imported. Version 0.70.6 fixes the vulnerability by escaping schema values rendered into generated string literals.

Affected products

• marcosschroh dataclasses-avroschema: from 0.38.0, < 0.70.6

References

• https://github.com/marcosschroh/dataclasses-avroschema/commit/01e6d5e15ab0ff69faac39a340d21b85da1e852f
• https://github.com/marcosschroh/dataclasses-avroschema/releases/tag/0.70.6
• https://github.com/marcosschroh/dataclasses-avroschema/security/advisories/GHSA-9h8h-264x-jcg2
• https://github.com/marcosschroh/dataclasses-avroschema/security/advisories/GHSA-9h8h-264x-jcg2

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