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NVD description
kin-openapi is a Go project for handling OpenAPI files. Prior to 0.149.0, runtime request, response, and direct schema validation lacks cycle detection when an allOf, anyOf, or oneOf chain refers back to an ancestor schema, even though loading and document validation accept the circular reference. A request or response that reaches the affected schema causes unbounded recursion in Schema.visitJSON or openapi3filter.decodeValue and exhausts the Go goroutine stack. The resulting fatal stack overflow cannot be caught with recover and terminates the entire process, including unrelated requests. This issue is fixed in version 0.149.0.
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
NONE
Momentum
NONE
CVE-2026-100354: kin-openapi's Validate() accepts circular allOf/anyOf/oneOf schemas, but runtime validation recurses with no cycle check. The Go stack overflow is fatal and unrecoverable, so a request can end the process. PoC used v0.144.0. #infosec https://github.com/advisories/GHSA-g8cf-rcjf-c8cf