Bug 2553592 (CVE-2026-100353)

Summary: CVE-2026-100353 github.com/getkin/kin-openapi: kin-openapi: Denial of Service via nil-pointer dereference in request decoding
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in kin-openapi. An unauthenticated remote attacker can cause a Denial of Service (DoS) by sending specially crafted HTTP requests containing specific array query parameters or form-encoded data. Because the request decoder fails to properly validate certain array schemas before accessing them, processing these requests triggers an unhandled crash.
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Description OSIDB Bzimport 2026-10-15 16:22:57 UTC 
kin-openapi is a Go project for handling OpenAPI files. From 0.136.0 until 0.149.0, three openapi3filter decoder paths that were missed by the fix for GHSA-p6wj-qrr4-pgh5 lack a nil-items guard for legal OpenAPI 3.1 array schemas. An unauthenticated remote client can trigger a deterministic nil-pointer panic through an array query parameter, a deepObject query parameter containing an array property, or an application/x-www-form-urlencoded request body whose array property appears inside an allOf, anyOf, or oneOf subschema. The query and composed-body paths reach urlValuesDecoder.parseArray, while the deepObject path reaches buildResObj, and all pass a nil items schema into code that dereferences it. This issue is fixed in version 0.149.0.