Vulnerability · Published Oct 13, 2026 · Assigned by GitHub_M

CVE-2026-108384dataclasses-avroschema allows code injection through fixed-type aliases supplied as a bare string

High 8.8

In plain English

A high-severity code injection in dataclasses-avroschema from marcosschroh. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 28% of all known vulnerabilities).

Severity (CVSS 3.1)8.8High

Exploit odds (30 days)0.3%top 72.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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, 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.

Affected products (as reported)

Vendor	Product	Versions
marcosschroh	dataclasses-avroschema	>= 0.38.0, < 0.70.6

Weakness: CWE-94 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References

https://github.com/marcosschroh/dataclasses-avroschema/security/advisories/GHSA-8j5c-xq6f-2c43 x_refsource_CONFIRM
https://github.com/marcosschroh/dataclasses-avroschema/commit/429f3d705d2d04c0c65e2ef832daed5ff91318fc x_refsource_MISC
https://github.com/marcosschroh/dataclasses-avroschema/releases/tag/0.70.6 x_refsource_MISC