CVE-2026-34204 HIGH

CVE-2026-34204: MinIO is Vulnerable to SSE Metadata Injection via Replication Headers

Vendor Minio
Product minio
Weakness CWE-287 · Improper authentication
Published March 31, 2026
Last update April 1, 2026
View on NVD All CVEs

CVSS base score

7.1/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality —
Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

March 31, 2026 CVE published
April 1, 2026 Record updated