CVE-2026-55391CWE-350CWE-367CWE-918ssrf

CVE-2026-55391

High · published July 29, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
22.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00305 · 22.1th percentile
Weaknesses
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)
Published
2026-07-29T02:17Z
Affected products (1)
ProductVersionsFixed in
koxudaxi/datamodel-code-generator< 0.63.00.63.0
References (4)
https://github.com/koxudaxi/datamodel-code-generator/commit/25c8b7e497419eb20b230fa3318c04f9bebc5a6f · [email protected]https://github.com/koxudaxi/datamodel-code-generator/releases/tag/0.63.0 · [email protected]https://github.com/koxudaxi/datamodel-code-generator/security/advisories/GHSA-vx7x-vcc2-c44g · [email protected]https://gist.github.com/thegr1ffyn/c1d54dd6ff2a4c0d7d0dabe00c4985f4 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 28 JUL 21:45Z
    datamodel-code-generator vulnerable to SSRF protection bypass via DNS rebinding
    cvelistv5