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TI-2026-71965 Aliases CVE-2026-108379

Code injection in dataclasses-avroschema fixed type namespaces

Priority MEDIUM 40CWE-94Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-94.

Summary

dataclasses-avroschema from 0.38.0 before 0.70.6 generates Python code from Avro schemas. BaseGenerator.parse_fixed inserts a fixed type's namespace between quotes in a generated annotation without escaping or validating it (CWE-94). A crafted quote ends the string and alters the annotation expression, which Python evaluates when the generated class is defined, letting an attacker run arbitrary code.

Written with Claude Haiku 5.5 from the sources below · 2026-10-27

Description from the CNA

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 inserts a fixed type's namespace value between quotes inside a generated types.confixed annotation without escaping or validating it. A crafted quote can terminate the namespace string and alter the surrounding annotation expression, which Python evaluates when the generated class is defined, allowing arbitrary code execution. Version 0.70.6 fixes the vulnerability by requiring the namespace to be a dot-separated sequence of valid Avro names.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00343 27th percentileScored 2026-11-07
Fix Fixed dataclasses-avroschema (marcosschroh): 0.70.6

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
marcosschrohdataclasses-avroschema0.38.0 to before 0.70.60.70.6Patch availableCNA
  • dataclasses-avroschema Vendormarcosschroh Affected 0.38.0 to before 0.70.6 Fixed in 0.70.6 Patch available CNA

Remediation

Upgrade dataclasses-avroschema to version 0.70.6, which requires the namespace to be a dot-separated sequence of valid Avro names.

Written with Claude Haiku 5.5 from the sources below · 2026-10-27

  • Fix · CNA dataclasses-avroschema (marcosschroh) Fixed in 0.70.6

Timeline

  1. 2026-10-13 Threatist record created from CVE-2026-108379
  2. 2026-10-13 CISA SSVC decision points changed
  3. 2026-10-13 Priority changed: MEDIUM → LOW
  4. 2026-10-14 Priority changed: LOW → MEDIUM

References

Other 3

  • TI-2026-71971 Code injection in dataclasses-avroschema enum generation CVSS 3.1HIGH 8.8
  • TI-2026-71968 Code injection in dataclasses-avroschema through enum symbol literals CVSS 3.1HIGH 8.8
  • TI-2026-71967 Code injection in dataclasses-avroschema Pydantic model generation CVSS 3.1HIGH 8.8
  • TI-2026-71966 Code injection in dataclasses-avroschema Pydantic field documentation CVSS 3.1HIGH 8.8
  • TI-2026-71964 Code injection in dataclasses-avroschema generated class docstrings CVSS 3.1HIGH 8.8
  • TI-2026-71963 Code injection in dataclasses-avroschema through Meta.schema_name CVSS 3.1HIGH 8.8
See all 10 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences