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 0.63.0, datamodel-code-generator validates a URL host once in src/datamodel_code_generator/http.py through get_body, _validate_url_for_fetch, and _get_ips_from_host, but then lets httpx resolve the host again for the connection, allowing DNS rebinding to bypass allow_private_network=False and reach internal services. This issue is fixed in version 0.63.0.
Affected products
koxudaxi: datamodel-code-generator
References4
- github.com/koxudaxi/datamodel-code-generator/security/advisorie… ExploitVendor Advisory
- github.com/koxudaxi/datamodel-code-generator/commit/25c8b7e4974… Patch
- github.com/koxudaxi/datamodel-code-generator/releases/tag/0.63.0 Release Notes
- gist.github.com/thegr1ffyn/c1d54dd6ff2a4c0d7d0dabe00c4985f4 Third Party Advisory
Metrics
- CVSS 3.1
-
7.5
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N - EPSS — exploit probability
- 0% percentile: 24 · as of 13 November 2026
- CWE
- CWE-350CWE-367CWE-918
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.