CVE-2026-55391: 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. Pr

highCVSS 7.5CVE-2026-55391

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.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: high — CVSS 7.5
Published: 2026-07-28
Last updated: 2026-07-30
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-55391

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-553910.20% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 10% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-55391	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

highGHSA-vx7x-vcc2-c44g: datamodel-code-generator vulnerable to SSRF protection bypass via DNS rebindingghsa

Recent advisories for datamodel-code-generator generates Pydantic

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highCVE-2026-55415: datamodel-code-generator generates Pydantic v2 models, dataclasses, TypedDict, and msgspec.Str…nvd · 2026-07-28
highCVE-2026-55389: datamodel-code-generator generates Pydantic v2 models, dataclasses, TypedDict, and msgspec.Str…nvd · 2026-07-28
highCVE-2026-54690: datamodel-code-generator generates Pydantic v2 models, dataclasses, TypedDict, and msgspec.Str…nvd · 2026-07-28
highCVE-2026-54656: datamodel-code-generator generates Pydantic v2 models, dataclasses, TypedDict, and msgspec.Str…nvd · 2026-07-28
highCVE-2026-54653: datamodel-code-generator generates Pydantic v2 models, dataclasses, TypedDict, and msgspec.Str…nvd · 2026-07-28