datamodel-code-generator vulnerable to SSRF protection bypass via DNS rebinding

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-55391
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-28 22:17:48 UTC
Updated2026-07-30 19:07:59 UTC
Descriptiondatamodel-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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N

EPSS: 0.001970000 probability, percentile 0.096890000 (date 2026-08-01)

Problem Types: CWE-350 | CWE-367 | CWE-918 | CWE-350 CWE-350: Reliance on Reverse DNS Resolution for a Security-Critical Action | CWE-367 CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition | CWE-918 CWE-918: Server-Side Request Forgery (SSRF)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Koxudaxi Datamodel-code-generator affected < 0.63.0 Not specified

References

ReferenceSourceLinkTags
gist.github.com/thegr1ffyn/c1d54dd6ff2a4c0d7d0dabe00c4985f4 134c704f-9b21-4f2e-91b3-4a467353bcc0 gist.github.com
github.com/koxudaxi/datamodel-code-generator/releases/tag/0.63.0 [email protected] github.com
github.com/koxudaxi/datamodel-code-generator/security/advisories/GHSA-vx... [email protected] github.com
github.com/koxudaxi/datamodel-code-generator/commit/25c8b7e497419eb20b23... [email protected] github.com
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