# CVE-2026-108384: dataclasses-avroschema allows code injection through fixed-type aliases supplied as a bare string

> Attackers can execute arbitrary code by supplying a bare string as a fixed-type alias in a crafted Avro schema, affecting users of dataclasses-avroschema.

- **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:** 13 Oct 2026
- **Also known as:** GHSA-8j5c-xq6f-2c43

## What is CVE-2026-108384?

CVE-2026-108384 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 0.38.0 through 0.70.5, BaseGenerator.parse_fixed interpolates a fixed type's aliases value directly into a generated types.confixed annotation. A list is represented with quoted entries, but a bare string is emitted as an unquoted Python expression and evaluated when the generated module is imported, allowing arbitrary code execution from a crafted schema. Version 0.70.6 fixes the vulnerability by rejecting aliases values that are not lists.

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

## Which versions are affected by CVE-2026-108384?


## How do I fix CVE-2026-108384?

No fix has been published for CVE-2026-108384 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-108384 being exploited?

There is no known exploitation of CVE-2026-108384 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-108384 and fix it if it is affected.

What it is: CVE-2026-108384 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: There is no known exploitation of CVE-2026-108384 in the wild and no public exploit code.

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-2026-108384/ (Markdown: https://insights.sbomify.com/CVE-2026-108384/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-108384
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-108384
- OSV: https://osv.dev/vulnerability/CVE-2026-108384

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-108384/
Summaries are generated and may contain mistakes; the official description above is the record.