How severe is CVE-2026-55391?

CVE-2026-55391 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability none.

Is CVE-2026-55391 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-55391?

CVE-2026-55391 affects Koxudaxi Datamodel-code-generator. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-55391?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2026-55391 published?

CVE-2026-55391 was published on 2026-07-28 and last updated on 2026-08-06.

CVE-2026-55391

CVE-2026-55391 is a high-severity vulnerability in Koxudaxi Datamodel-code-generator with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-350.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (9th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-350
Affected product: Koxudaxi Datamodel-code-generator
Published: 2026-07-28
Last modified: 2026-08-06

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.

Frequently asked questions

What is 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. 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.
How severe is CVE-2026-55391?: CVE-2026-55391 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability none.
Is CVE-2026-55391 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-55391?: CVE-2026-55391 affects Koxudaxi Datamodel-code-generator. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-55391?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2026-55391 published?: CVE-2026-55391 was published on 2026-07-28 and last updated on 2026-08-06.

References

Affected products (1)

cpe:2.3:a:koxudaxi:datamodel-code-generator:*:*:*:*:*:*:*:*

More vulnerabilities in Koxudaxi Datamodel-code-generator

CVE-2026-54653 — High (CVSS 8.8): datamodel-code-generator generates Pydantic v2 models, dataclasses, TypedDict, and msgspec.Struct from OpenAPI, JSON…
CVE-2026-54690 — High (CVSS 8.2): datamodel-code-generator generates Pydantic v2 models, dataclasses, TypedDict, and msgspec.Struct from OpenAPI, JSON…
CVE-2026-54656 — High (CVSS 7.8): datamodel-code-generator generates Pydantic v2 models, dataclasses, TypedDict, and msgspec.Struct from OpenAPI, JSON…
CVE-2026-55415 — High (CVSS 7.5): datamodel-code-generator generates Pydantic v2 models, dataclasses, TypedDict, and msgspec.Struct from OpenAPI, JSON…
CVE-2026-55389 — High (CVSS 7.5): datamodel-code-generator generates Pydantic v2 models, dataclasses, TypedDict, and msgspec.Struct from OpenAPI, JSON…

All CVEs affecting Koxudaxi Datamodel-code-generator →

Other CWE-350 vulnerabilities

CVE-2026-1490 — Critical (CVSS 9.8): The Spam protection, Anti-Spam, FireWall by CleanTalk plugin for WordPress is vulnerable to unauthorized Arbitrary…
CVE-2023-52235 — High (CVSS 8.8): SpaceX Starlink Wi-Fi router GEN 2 before 2023.53.0 and Starlink Dish before 07dd2798-ff15-4722-a9ee-de28928aed34 allow…
CVE-2025-8036 — High (CVSS 8.1): Thunderbird cached CORS preflight responses across IP address changes. This allowed circumventing CORS with DNS…
CVE-2026-33002 — High (CVSS 7.5): Jenkins 2.442 through 2.554 (both inclusive), LTS 2.426.3 through LTS 2.541.2 (both inclusive) performs origin…
CVE-2021-34561 — High (CVSS 7.5): In PEPPERL+FUCHS WirelessHART-Gateway <= 3.0.8 serious issue exists, if the application is not externally accessible or…
CVE-2021-22884 — High (CVSS 7.5): Node.js before 10.24.0, 12.21.0, 14.16.0, and 15.10.0 is vulnerable to DNS rebinding attacks as the whitelist includes…

Browse all CWE-350 vulnerabilities →