Is CVE-2026-108376 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-108376 being exploited in the wild.

How severe is CVE-2026-108376?

High severity, with a CVSS score of 8.8, published 13 October 2026.

Which products and versions are affected?

Dataclasses-Avroschema 0.47.3 through 0.70.5.

Is there a fix for CVE-2026-108376?

Yes: fixed in 0.70.6. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-108376 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-108376?

Check whether you run Dataclasses-Avroschema at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-108376: dataclasses-avroschema code injection in generated model defaults

CVE-2026-108376 · Severity: high · CVSS 8.8 · Published 2026-10-13

dataclasses-avroschema is a Python library that automatically generates data models and schemas from Avro specifications. Versions 0.47.3 through 0.70.5 allow arbitrary Python code to execute when a crafted Avro schema is used to generate a model, via an unvalidated record name in a default factory. An attacker who controls a schema registry or network traffic could inject malicious code that runs when a model is instantiated.

Technologies: Dataclasses-Avroschema. Vendors: Dataclasses-Avroschema.

Quick answers

Is CVE-2026-108376 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-108376 being exploited in the wild.
How severe is CVE-2026-108376?: High severity, with a CVSS score of 8.8, published 13 October 2026.
Which products and versions are affected?: Dataclasses-Avroschema 0.47.3 through 0.70.5.
Is there a fix for CVE-2026-108376?: Yes: fixed in 0.70.6. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-108376 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-108376?: Check whether you run Dataclasses-Avroschema at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: 0.70.6

Technical details

The vulnerability exists in FieldRepresentation.get_field_default, which inserts a schema-controlled record name directly into the callable position of a generated `default_factory` lambda without validating it as a valid Avro name. A crafted record name can become an arbitrary Python expression that executes during model instantiation. The fix in version 0.70.6 validates record names against the Avro name grammar ([A-Za-z_][A-Za-z0-9_]*), rejecting any that do not conform.

Affected products

dataclasses-avroschema dataclasses-avroschema 0.47.3 through 0.70.5

Timeline

2026-10-13: disclosed
2026-08-18: patched

References

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