CVE-2026-34204CWE-287

MinIO is Vulnerable to SSE Metadata Injection via Replication Headers

High · published March 31, 2026

CVSS v4.0
7.1
EPSS
0%
Percentile
10.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
7.1 · HIGH
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
EPSS
0.00208 · 10.4th percentile
Weakness
CWE-287 · Improper Authentication
Published
2026-03-31T19:30Z
EPSS history
Timeline
  • 31 MAR 19:30Z
    MinIO is Vulnerable to SSE Metadata Injection via Replication Headers
    cvelistv5