CVE-2026-73502
MediumCVSS 5.3Exploitation Probability (EPSS)
Low risk41th percentile - higher than 41% of all known CVEs
Summary
kin-openapi, a Go project for handling OpenAPI files, from 0.2.0 until 0.144.0 contains a NULL-pointer-dereference denial of service vulnerability in openapi3filter.ValidateRequest when an operation declares a content parameter whose application/json media type has no schema. 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.
Risk Assessment
The risk includes service disruptions for applications using kin-openapi, potentially leading to unavailability and financial losses.
Recommendation
It is recommended to upgrade kin-openapi to version 0.144.0 or later and review OpenAPI definitions for content parameters without schemas.
Original NVD description (English source)
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.