# CVE-2026-55391

## Summary

- **CVE ID:** CVE-2026-55391
- **Severity:** HIGH
- **CVSS Score:** 7.5 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N)
- **CWE:** CWE-350, CWE-367, CWE-918
- **Published:** Jul 28, 2026
- **Last Modified:** Jul 29, 2026

## 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 (< 0.63.0)

## References

- [CNA](https://github.com/koxudaxi/datamodel-code-generator/security/advisories/GHSA-vx7x-vcc2-c44g)
- [CNA](https://github.com/koxudaxi/datamodel-code-generator/commit/25c8b7e497419eb20b230fa3318c04f9bebc5a6f)
- [CNA](https://github.com/koxudaxi/datamodel-code-generator/releases/tag/0.63.0)
- [CISA-ADP](https://gist.github.com/thegr1ffyn/c1d54dd6ff2a4c0d7d0dabe00c4985f4)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.24%
- **EPSS Percentile:** 14.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._