High
datamodel-code-generator vulnerable to SSRF protection bypass via DNS rebinding
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-55391
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 08:42 UTC · Revision 1
Source evidence
datamodel-code-generator vulnerable to SSRF protection bypass via DNS rebinding
core-osv · Original sourcePublished 28 Jul 2026, 21:45 UTC
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.
osv:CVE-2026-55391
Complete source record
{
"id": "171876cb3ffe766e525eb3d9fa891268584fd18186d04c1f5ae4d576f79302cf",
"url": "https://osv.dev/vulnerability/CVE-2026-55391",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "datamodel-code-generator vulnerable to SSRF protection bypass via DNS rebinding",
"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.",
"evidence": "osv:CVE-2026-55391",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-55391",
"aliases": [
"CVE-2026-55391",
"GHSA-vx7x-vcc2-c44g",
"PYSEC-2026-3565"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/datamodel-code-generator/datamodel-code-generator",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "a1252a218df10537cd0526ae69757cde446a1ce6"
},
{
"fixed": "25c8b7e497419eb20b230fa3318c04f9bebc5a6f"
}
],
"database_specific": {
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{
"cpe": "cpe:2.3:a:koxudaxi:datamodel-code-generator:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "0.63.0"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "25c8b7e497419eb20b230fa3318c04f9bebc5a6f"
}
],
"source": "REFERENCES_COMMIT"
},
{
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"source": "REFERENCES_TAG",
"original_tag": "0.63.0"
}
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55391.json"
}
}
],
"modified": "2026-10-28T02:30:27.140950991Z",
"provider": "osv",
"references": [
"https://github.com/koxudaxi/datamodel-code-generator/releases/tag/0.63.0",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55391.json",
"https://github.com/koxudaxi/datamodel-code-generator/security/advisories/GHSA-vx7x-vcc2-c44g",
"https://nvd.nist.gov/vuln/detail/CVE-2026-55391",
"https://github.com/koxudaxi/datamodel-code-generator/commit/25c8b7e497419eb20b230fa3318c04f9bebc5a6f",
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],
"provider_metadata": {
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"CWE-367",
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],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55391.json"
}
},
"related_cves": [
{
"value": "CVE-2026-55391",
"evidence": "/id"
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],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 493944,
"published_at": "2026-07-28T21:45:39.058+00:00"
}