What’s Vulnerable › Vulnerabilities

CVE-2026-55391: datamodel-code-generator vulnerable to SSRF protection bypass via DNS rebinding

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-07-28 · updated 2026-10-23
• Weakness: CWE-350

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: before 0.63.0 — fixed in 0.63.0

How to fix

Upgrade to a fixed version: koxudaxi datamodel-code-generator 0.63.0. Check the vendor advisory for mitigations.

References

• https://github.com/koxudaxi/datamodel-code-generator/commit/25c8b7e497419eb20b230fa3318c04f9bebc5a6f
• https://github.com/koxudaxi/datamodel-code-generator/releases/tag/0.63.0
• https://github.com/koxudaxi/datamodel-code-generator/security/advisories/GHSA-vx7x-vcc2-c44g
• https://gist.github.com/thegr1ffyn/c1d54dd6ff2a4c0d7d0dabe00c4985f4

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