High severity · published Oct 13, 2026
CVE-2026-108381
dataclasses-avroschema pydantic-class metadata allows code injection in generated annotations
8.8
CVSS
0.4%
EPSS
No
On KEV
Description
dataclasses-avroschema generates Avro schemas from Python dataclasses, Pydantic models, and Faust Records and generates Python code from Avro schemas. From version 0.44.0 through 0.70.5, the Pydantic and AvroDantic model generators insert a schema field's pydantic-class value after pydantic. in a generated field annotation without safely restricting the expression. Because annotations are evaluated when the generated module is imported, a crafted value can execute arbitrary Python code. Version 0.70.6 fixes the vulnerability by restricting the value to a bare name or a call to a bare name with literal arguments.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 32% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DA
dataclasses-avroschema · marcosschroh
>= 0.44.0, < 0.70.6 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-108381
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-108381
x_refsource_CONFIRM
https://github.com/marcosschroh/dataclasses-avroschema/security/advisories/GHSA-4jmx-9m83-vxx8
x_refsource_MISC
https://github.com/marcosschroh/dataclasses-avroschema/pull/358
x_refsource_MISC
https://github.com/marcosschroh/dataclasses-avroschema/commit/429f3d705d2d04c0c65e2ef832daed5ff91318fc
x_refsource_MISC
https://github.com/marcosschroh/dataclasses-avroschema/releases/tag/0.70.6
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