Vulnerability Description
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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/getkin/kin-openapi/commit/68ac2affa325514d7d6e731204d6a1edf6b
- https://github.com/getkin/kin-openapi/releases/tag/v0.144.0
- https://github.com/getkin/kin-openapi/security/advisories/GHSA-jpcw-4wr7-c3vq
- https://github.com/getkin/kin-openapi/security/advisories/GHSA-jpcw-4wr7-c3vq
FAQ
What is CVE-2026-73502?
CVE-2026-73502 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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...
How severe is CVE-2026-73502?
CVE-2026-73502 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-73502?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.