CVE-2026-108380 dataclasses-avroschema field documentation allows code injection in generated Pydantic descriptions
Attackers can execute arbitrary Python code by injecting expressions into Pydantic field descriptions during schema generation.
- 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-2026-108380?
CVE-2026-108380 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 0.65.9 through 0.70.5, PydanticFieldRepresentation.add_field_properties inserts a schema field's doc value between the quotes of a generated pydantic.Field description argument without escaping it. A crafted quote can terminate the string and inject an expression evaluated during generated class definition, allowing arbitrary Python code execution for Pydantic and AvroDantic model generation. Version 0.70.6 fixes the vulnerability by escaping the documentation value before rendering it.
Weakness: CWE-94
Which versions are affected by CVE-2026-108380?
How do I fix CVE-2026-108380?
No fix has been published for CVE-2026-108380 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-2026-108380 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-108380 exists.
Sources
Also known as GHSA-g7p7-mgvm-jw7p.