CVE-2026-97731: Improper Verification of Cryptographic Signature

MinIO through 7aac2a2 does not verify that every x-amz- header present on a request also appears in the client-supplied X-Amz-SignedHeaders list. extractSignedHeaders in cmd/signature-v4-utils.go iterates only the claimed list and never enumerates the headers that actually arrived, and thus a...