Is CVE-2026-34204 actively exploited?

CVE-2026-34204 has no public evidence of in-the-wild exploitation as of 2026-04-07.

What is the CVSS score for CVE-2026-34204?

CVE-2026-34204 has a CVSS score of 7.1 (HIGH severity). 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X.

How do I patch CVE-2026-34204?

Patch guidance is available from minio security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2026-34204.

Fix CVE-2026-34204 - HIGH minio minio

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 Metrics

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector: network
Complexity: low
Privileges: low
User Action: none
Confidentiality: undefined
Integrity: undefined
Availability: undefined
Weaknesses: CWE-287 · Improper Authentication

Metadata

Primary Vendor: MINIO
Published: 3/31/2026
Last Modified: 4/7/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

CVE-2026-34204

Description

CVSS Metrics

Metadata

Affected Products

Remediation Guidance

Executive Summary