kin-openapi: ValidationHandler security-requirement bypass via encoded-path operation confusion

Summary openapi3filter.ValidationHandler.Middleware validates requests with kin-openapi's legacy router, which selects an OpenAPI operation from the decoded URL.Path. The method is documented as implementing gorilla/mux.MiddlewareFunc, but a downstream gorilla/mux router configured with...

CVE-2026-100351 kin-openapi: ValidationHandler security-requirement bypass via encoded-path operation confusion

kin-openapi is a Go project for handling OpenAPI files. From 0.144.0 until 0.147.0, openapi3filter.ValidationHandler validates an operation selected from decoded URL.Path while a downstream gorilla/mux router configured with UseEncodedPath can dispatch a different operation selected from...

CVE-2026-100351

The kin-openapi Go project (versions 0.144.0 through 0.147.0 ) contains a security requirement bypass in the openapi3filter.ValidationHandler . The vulnerability stems from an interpretation conflict: the handler validates operations based on the decoded URL.Path , while a downstream gorilla/mux ...