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TI-2026-71962 Aliases CVE-2026-108376

Code injection in dataclasses-avroschema via Avro record names

Priority HIGH 73CWE-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

The dataclasses-avroschema package from 0.47.3 before 0.70.6 generates Python code from Avro schemas. Its FieldRepresentation.get_field_default method inserts a referenced record name into a generated default_factory lambda without validating it as an Avro name, which is a code injection flaw (CWE-94). A crafted record name can become an arbitrary Python expression that runs when an instance of the generated model consumes the field default.

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 0.47.3 through 0.70.5, FieldRepresentation.get_field_default inserts a schema-controlled referenced record name into the callable position of a generated default_factory lambda without validating it as an Avro name. A crafted record name can become an arbitrary Python expression that executes when an instance of the generated model consumes the field default. Version 0.70.6 fixes the vulnerability by rejecting record names that do not match the Avro name grammar.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0048 41st percentileScored 2026-11-07
Fix Fixed dataclasses-avroschema (marcosschroh): 0.70.6

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
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-avroschema0.47.3 to before 0.70.60.70.6Patch availableCNA
  • dataclasses-avroschema Vendormarcosschroh Affected 0.47.3 to before 0.70.6 Fixed in 0.70.6 Patch available CNA

Remediation

Upgrade dataclasses-avroschema to version 0.70.6, which rejects record names that do not match the Avro name grammar.

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-2026-108376
  2. 2026-10-14 Priority changed: MEDIUM → LOW
  3. 2026-10-18 CISA SSVC decision points changed
  4. 2026-10-18 Priority changed: LOW → HIGH

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