marcosschroh dataclasses-avroschema up to 0.70.5 BaseGenerator.parse_fixed code injection

Summaryinfo

A vulnerability categorized as critical has been discovered in marcosschroh dataclasses-avroschema up to 0.70.5. Affected by this issue is the function BaseGenerator.parse_fixed. Executing a manipulation can lead to code injection. This vulnerability is registered as CVE-2026-108384. It is possible to launch the attack remotely. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in marcosschroh dataclasses-avroschema up to 0.70.5. This vulnerability affects the function BaseGenerator.parse_fixed. The manipulation with an unknown input leads to a code injection vulnerability. The CWE definition for the vulnerability is CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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, BaseGenerator.parse_fixed interpolates a fixed type's aliases value directly into a generated types.confixed annotation. A list is represented with quoted entries, but a bare string is emitted as an unquoted Python expression and evaluated when the generated module is imported, allowing arbitrary code execution from a crafted schema. Version 0.70.6 fixes the vulnerability by rejecting aliases values that are not lists.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-108384 since 10/09/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1059.

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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