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TI-2026-39962 Aliases CVE-2026-55391GHSA-vx7x-vcc2-c44g

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

Priority HIGH 66CWE-350Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
—
Confidentiality · integrity · availability
High · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00305 23rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed datamodel-code-generator (koxudaxi): 0.63.0datamodel-code-generator (PyPI): 0.63.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
koxudaxidatamodel-code-generatorbefore 0.63.00.63.0Patch availableCNA
—datamodel-code-generator (PyPI)before 0.63.00.63.0Patch availableGHSA-vx7x-vcc2-c44g
  • datamodel-code-generator Vendorkoxudaxi Affected before 0.63.0 Fixed in 0.63.0 Patch available CNA
  • datamodel-code-generator (PyPI) Vendor— Affected before 0.63.0 Fixed in 0.63.0 Patch available GHSA-vx7x-vcc2-c44g

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:koxudaxi:datamodel-code-generator:*:*:*:*:*:*:*:*before 0.63.0Vulnerablekoxudaxi
  • cpe:2.3:a:koxudaxi:datamodel-code-generator:*:*:*:*:*:*:*:* Versions before 0.63.0 Vulnerable ·koxudaxi

Remediation

  • Fix · CNA datamodel-code-generator (koxudaxi) Fixed in 0.63.0
  • Fix · GHSA-vx7x-vcc2-c44g datamodel-code-generator (PyPI) Fixed in 0.63.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-55391
  2. 2026-10-03 Alias added: GHSA-vx7x-vcc2-c44g

References

Exploit 1

Patch 1

Advisory 1

Other 2

  • TI-2026-39960 Information disclosure in koxudaxi datamodel-code-generator CVSS 3.1HIGH 7.5
  • TI-2026-39511 datamodel-code-generator vulnerable to SSRF via JSON-Schema `$ref` to HTTP URL (silent by default) CVSS 3.1HIGH 8.2
  • TI-2026-39483 Code injection in koxudaxi datamodel-code-generator CVSS 3.1HIGH 7.8
  • TI-2026-39984 Code injection in koxudaxi datamodel-code-generator CVSS 3.1HIGH 7.5
  • TI-2026-39480 `datamodel-code-generator` vulnerable to code injection in via attacker-controlled `default_factory` schema field CVSS 3.1HIGH 8.8

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences