{"id":"CVE-2026-55391","aliases":["GHSA-vx7x-vcc2-c44g","PYSEC-2026-3565"],"url":"https://o3.security/vulnerability/CVE-2026-55391","summary":"datamodel-code-generator vulnerable to SSRF protection bypass via DNS rebinding","details":"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.","published":"2026-07-28T21:45:39.058Z","modified":"2026-09-12T11:46:18.147491986Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N"},"epss":{"score":0.00236,"percentile":0.14761,"asOf":"2026-09-15"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"datamodel-code-generator","fixedVersion":"0.63.0"}],"fix":{"url":"https://github.com/koxudaxi/datamodel-code-generator/commit/25c8b7e497419eb20b230fa3318c04f9bebc5a6f","label":"koxudaxi/datamodel-code-generator@25c8b7e"},"references":[{"type":"WEB","url":"https://github.com/koxudaxi/datamodel-code-generator/releases/tag/0.63.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55391.json"},{"type":"ADVISORY","url":"https://github.com/koxudaxi/datamodel-code-generator/security/advisories/GHSA-vx7x-vcc2-c44g"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55391"},{"type":"FIX","url":"https://github.com/koxudaxi/datamodel-code-generator/commit/25c8b7e497419eb20b230fa3318c04f9bebc5a6f"},{"type":"EVIDENCE","url":"https://gist.github.com/thegr1ffyn/c1d54dd6ff2a4c0d7d0dabe00c4985f4"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-12T11:46:18.147491986Z"}}