BIT-MINIO-2026-34204 MinIO is Vulnerable to SSE Metadata Injection via Replication Headers

MinIO is a high-performance object storage system. Prior to version 2026.03.26, a flaw in extractMetadataFromMime allows any authenticated user with s3:PutObject permission to inject internal server-side encryption metadata into objects by sending crafted X-Minio-Replication- headers on a normal...

CVE-2026-34204

MinIO is vulnerable to SSE metadata injection via replication headers (CVE-2026-34204). Affected component is cmd/handler-utils.go, extractMetadataFromMime(). An authenticated user with s3:PutObject permission can send crafted X-Minio-Replication-* headers (without X-Minio-Source-Replication-Requ...

CVE-2026-34204

MinIO is a high-performance object storage system. Prior to version RELEASE.2026-03-26T21-24-40Z, a flaw in extractMetadataFromMime allows any authenticated user with s3:PutObject permission to inject internal server-side encryption metadata into objects by sending crafted X-Minio-Replication-...

MinIO is Vulnerable to SSE Metadata Injection via Replication Headers

Impact What kind of vulnerability is it? Who is impacted? A flaw in extractMetadataFromMime allows any authenticated user with s3:PutObject permission to inject internal server-side encryption metadata into objects by sending crafted X-Minio-Replication- headers on a normal PutObject request. The...