CVE-2026-55389 datamodel-code-generator vulnerable to arbitrary local file read via JSON-Schema `$ref` (`file://` and `../` traversal), bypassing `--no-allow-remote-refs`
Attackers can read arbitrary local files by exploiting JSON-Schema reference resolution, bypassing remote reference restrictions in datamodel-code-generator.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-55389?
CVE-2026-55389 is a high-severity path traversal vulnerability in koxudaxi datamodel-code-generator, published on 28 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
datamodel-code-generator generates Pydantic v2 models, dataclasses, TypedDict, and msgspec.Struct from OpenAPI, JSON Schema, GraphQL, Avro, Protobuf, and raw JSON, YAML, or CSV. Prior to 0.62.0, datamodel-code-generator resolves JSON Schema $ref targets in src/datamodel_code_generator/parser/jsonschema.py through is_url and _get_ref_body without containing file:// or ../ traversal references to the input directory and without honoring --no-allow-remote-refs, allowing arbitrary local file reads. This issue is fixed in version 0.62.0.
Which versions are affected by CVE-2026-55389?
3 open source packages ship an affected version, including datamodel-code-generator. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
datamodel-code-generator PyPI | All versions | 0.62.0 |
datamodel-code-generator PyPI | All versions | 0.62.0 |
datamodel-code-generator PyPI | All versions | 0.62.0 |
Products include Koxudaxi Datamodel-Code-Generator.
How do I fix CVE-2026-55389?
Upgrade datamodel-code-generator to 0.62.0 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-55389 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-55389 exists.
Other vulnerabilities in koxudaxi datamodel-code-generator
- CVE-2026-54653 `datamodel-code-generator` vulnerable to code injection in via attacker-controlled `default_factory` schema field
- CVE-2026-54690 datamodel-code-generator vulnerable to SSRF via JSON-Schema `$ref` to HTTP URL (silent by default)
- CVE-2026-54656 `datamodel-code-generator` vulnerable to code execution on import via unescaped `validators` entries in --extra-template-data
- CVE-2026-55391 datamodel-code-generator vulnerable to SSRF protection bypass via DNS rebinding
- CVE-2026-55415 datamodel-code-generator vulnerable to code injection via `x-python-import` / `customTypePath` in generated import statements
Sources
Also known as GHSA-8359-h9fx-j6v9, MINI-6qc7-gqgq-433m, PYSEC-2026-3558.