High · CVSS 8.8CVE-2026-108380

dataclasses-avroschema field documentation allows code injection in generated Pydantic descriptionsCVE-2026-108380

Answer in brief

CVE-2026-108380 records a High severity (CVSS 8.8) vulnerability in dataclasses-avroschema field documentation allows code injection in generated Pydantic descriptions. The current sources do not mark it as known exploited. The current feed maps marcosschroh/dataclasses-avroschema (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 13, 2026Updated Oct 13, 2026Source checked Oct 13, 2026First seen by HOL Oct 13, 2026Material review Oct 13, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.8
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 8.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps marcosschroh/dataclasses-avroschema (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
marcosschroh/dataclasses-avroschemageneric	>=0.65.9 <0.70.6	0.70.6

Recommended response

Check inventory. Check lockfiles and deployed manifests for marcosschroh/dataclasses-avroschema.
Review the reported fix. Update marcosschroh/dataclasses-avroschema to 0.70.6 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Oct 13, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 13, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Oct 13, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.