# CVE-2026-108376: dataclasses-avroschema allows code injection through record names in generated default factories

> Attackers can execute arbitrary Python code by crafting malicious Avro schema record names that are injected into generated default factories.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 13 Oct 2026
- **Updated:** 16 Oct 2026
- **Also known as:** GHSA-jcjg-gjg5-xp7v

## What is CVE-2026-108376?

CVE-2026-108376 is a high-severity code injection vulnerability in marcosschroh dataclasses-avroschema, published on 13 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

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.

Weakness: CWE-94 (Improper Control of Generation of Code)

## Which versions are affected by CVE-2026-108376?


## How do I fix CVE-2026-108376?

No fix has been published for CVE-2026-108376 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-108376 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-108376 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-108376 and fix it if it is affected.

What it is: CVE-2026-108376 is a high-severity code injection vulnerability in marcosschroh dataclasses-avroschema, published on 13 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-108376 exists.

Affected product: marcosschroh dataclasses-avroschema. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-108376/ (Markdown: https://insights.sbomify.com/CVE-2026-108376/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-108376
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-108376
- OSV: https://osv.dev/vulnerability/CVE-2026-108376

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-108376/
Summaries are generated and may contain mistakes; the official description above is the record.