CVE-2026-108383 dataclasses-avroschema enum field defaults can inject statements into generated modules
Attackers can inject code into generated modules via malicious enum defaults in dataclasses-avroschema, leading to code execution or denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-108383?
CVE-2026-108383 is a high-severity code injection vulnerability in marcosschroh dataclasses-avroschema, published on 13 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-94
Which versions are affected by CVE-2026-108383?
How do I fix CVE-2026-108383?
No fix has been published for CVE-2026-108383 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-108383 being exploited?
There is no known exploitation of CVE-2026-108383 in the wild and no public exploit code.
Sources
Also known as GHSA-4xxf-mv22-hcr8.