CVE-2026-55391

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.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.2 / Impact : 4.7

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/koxudaxi/datamodel-code-generator/commit/25c8b7e497419eb20b230fa3318c04f9bebc5a6f	Patch
https://github.com/koxudaxi/datamodel-code-generator/releases/tag/0.63.0	Release Notes
https://github.com/koxudaxi/datamodel-code-generator/security/advisories/GHSA-vx7x-vcc2-c44g	Exploit Vendor Advisory
https://gist.github.com/thegr1ffyn/c1d54dd6ff2a4c0d7d0dabe00c4985f4	Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:koxudaxi:datamodel-code-generator:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-07-28 22:17

Updated : 2026-08-06 19:43

NVD link : CVE-2026-55391

Mitre link : CVE-2026-55391

CVE.ORG link : CVE-2026-55391

JSON object : View

Products Affected

koxudaxi

datamodel-code-generator

CWE

CWE-350

Reliance on Reverse DNS Resolution for a Security-Critical Action

CWE-367

Time-of-check Time-of-use (TOCTOU) Race Condition

CWE-918

Server-Side Request Forgery (SSRF)

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