Bug 2553590 (CVE-2026-100354)

Summary: CVE-2026-100354 github.com/getkin/kin-openapi: kin-openapi: Denial of Service via unbounded recursion during schema validation
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: high    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in kin-openapi. The runtime schema validation lacks cycle detection when processing circular schema references. A remote attacker can exploit this vulnerability by submitting a request or response that triggers recursive validation, leading to unbounded recursion and stack exhaustion. This condition causes the entire application process to crash, resulting in a Denial of Service (DoS).
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Description OSIDB Bzimport 2026-10-15 16:22:16 UTC 
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.