High severity · published Mar 31, 2026
CVE-2026-34204
MinIO is Vulnerable to SSE Metadata Injection via Replication Headers
7.1
CVSS
0.1%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
Low
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 3% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MI
minio · minio
< RELEASE.2026-03-26T21-24-40Z · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-34204
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-34204
Vendor Advisory
https://github.com/minio/minio/security/advisories/GHSA-3rh2-v3gr-35p9
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