What’s Vulnerable › Vulnerabilities

CVE-2026-108383: dataclasses-avroschema enum field defaults can inject statements into generated modules

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% 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 renders a schema-controlled enum field default as an enum member reference after applying case conversion but without validating it as an identifier. Newlines, operators, and punctuation can escape the intended reference and inject constrained statements into the generated module, allowing namespace modification or preventing the module from loading. Version 0.70.6 fixes the vulnerability by validating enum defaults as names.

Affected products

• marcosschroh dataclasses-avroschema: from 0.38.0, < 0.70.6

References

• https://github.com/marcosschroh/dataclasses-avroschema/commit/429f3d705d2d04c0c65e2ef832daed5ff91318fc
• https://github.com/marcosschroh/dataclasses-avroschema/releases/tag/0.70.6
• https://github.com/marcosschroh/dataclasses-avroschema/security/advisories/GHSA-4xxf-mv22-hcr8
• https://github.com/marcosschroh/dataclasses-avroschema/security/advisories/GHSA-4xxf-mv22-hcr8

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