getkin kin-openapi up to 0.143.x defaultContentParameterDecoder req_resp_decoder.go openapi3filter.ValidateRequest null pointer dereference

Summaryinfo

A vulnerability has been found in getkin kin-openapi up to 0.143.x and classified as problematic. This affects the function openapi3filter.ValidateRequest of the file openapi3filter/req_resp_decoder.go of the component defaultContentParameterDecoder. The manipulation leads to null pointer dereference. This vulnerability is uniquely identified as CVE-2026-73502. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in getkin kin-openapi up to 0.143.x. It has been rated as problematic. This issue affects the function openapi3filter.ValidateRequest of the file openapi3filter/req_resp_decoder.go of the component defaultContentParameterDecoder. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is availability. The summary by CVE is:

kin-openapi is a Go project for handling OpenAPI files. From 0.2.0 until 0.144.0, openapi3filter.ValidateRequest can encounter a NULL-pointer-dereference denial of service when an operation declares a content parameter whose application/json media type has no schema. In openapi3filter/req_resp_decoder.go, the default defaultContentParameterDecoder dereferences mt.Schema.Value without checking whether mt.Schema is nil, even though doc.Validate() accepts the document under OpenAPI 3.0.x and 3.1.x. A single unauthenticated request supplying the parameter value can panic request validation, causing an aborted request with log growth in the common synchronous net/http path or a full process crash in integrations without recovery. This issue is fixed in version 0.144.0.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-73502 since 08/12/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available.

Upgrading to version 0.144.0 eliminates this vulnerability.

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Productinfo

Vendor

• getkin

Name

• kin-openapi

Version

• 0.143

Website

• Product: https://github.com/getkin/kin-openapi/

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