CVE-2026-34204
MinIO is Vulnerable to SSE Metadata Injection via Replication Headers
7.1
HIGH
CVSS 3.1
EPSS 0.03%
Description
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 PutObject request. This issue has been patched in version 2026.03.26.
How to fix CVE-2026-34204
No fixed version has been published yet. Mitigate by removing the affected package or applying upstream guidance from the references below.
- —no fix listed
- —no fix listed
- —no fix listed
Is CVE-2026-34204 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (3)
- >= 2024.03.30
- >= 0.0.0-20240328174456-468a9fae83e9, <= 0.0.0-20260212201848-7aac2a2c5b7c
- >= 0.0.0-20240328174456-468a9fae83e9
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | 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 |
| osv | CVSS 3.1 | HIGH7.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H |