CVE-2026-34204: MinIO

High severity, CVSS 7.1. EPSS: 0.2% chance of exploitation in the next 30 days.

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-* headers on a normal PutObject request. This issue has been patched in version RELEASE.2026-03-26T21-24-40Z.

Affected products

• MinIO MinIO: before 2026-03-26t21-24-40z (fixed in 2026-03-26t21-24-40z)

Published 2026-03-31. Last modified 2026-07-24.