Vulnerability · Published Jul 28, 2026 · Assigned by GitHub_M

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

High 7.5

In plain English

A high-severity server-side request forgery in datamodel-code-generator from koxudaxi. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)0.3%top 76.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	datamodel-code-generator	0.63.0	GHSA-vx7x-vcc2-c44g
PyPI	datamodel-code-generator	0.63.0	PYSEC-2026-3565

Affected products (as reported)

Vendor	Product	Versions
koxudaxi	datamodel-code-generator	< 0.63.0

Weakness: CWE-350, CWE-367, CWE-918 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N

References

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