marcosschroh dataclasses-avroschema up to 0.70.5 Enum Default FieldRepresentation.get_field_default injection

Summaryinfo

A vulnerability identified as critical has been detected in marcosschroh dataclasses-avroschema up to 0.70.5. This affects the function FieldRepresentation.get_field_default of the component Enum Default Handler. The manipulation leads to injection. This vulnerability is documented as CVE-2026-108383. The attack can be initiated remotely. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in marcosschroh dataclasses-avroschema up to 0.70.5. This issue affects the function FieldRepresentation.get_field_default of the component Enum Default Handler. The manipulation with an unknown input leads to a injection vulnerability. Using CWE to declare the problem leads to CWE-74. The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-108383 since 10/09/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1055 for this issue.

Upgrading to version 0.70.6 eliminates this vulnerability.

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Productinfo

Vendor

• marcosschroh

Name

• dataclasses-avroschema

Version

• 0.70.0
• 0.70.1
• 0.70.2
• 0.70.3
• 0.70.4
• 0.70.5

Website

• Product: https://github.com/marcosschroh/dataclasses-avroschema/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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