CVE-2026-100349

kin-openapi is a Go project for handling OpenAPI files. Prior to 0.146.0, openapi3filter.ValidateResponse passes a nil response header schema to decodeValue when an OpenAPI document declares the header with content instead of schema. The document passes validation, but every response validation for the affected operation dereferences the nil schema and panics even when the response does not contain the declared header. Applications that ingest an untrusted specification can expose this as remote availability impact, while applications using only trusted local specifications still crash when the affected operation is exercised. This issue is fixed in version 0.146.0.

• CWE-476

• https://github.com/getkin/kin-openapi/commit/f5441d67f855ed34d975b3b85665764644ab1459
• https://github.com/getkin/kin-openapi/releases/tag/v0.146.0
• https://github.com/getkin/kin-openapi/security/advisories/GHSA-74vm-87hj-r66f

Published

Oct 15, 2026

Last Modified

Oct 16, 2026

Status

Deferred

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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