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CVE-2026-34204

MinIO is Vulnerable to SSE Metadata Injection via Replication Headers

HIGH
7.1
CVSS Score
Published: March 31, 2026 at 07:30 PM UTC
Updated: July 24, 2026 at 08:20 PM UTC
1 product affected across 1 vendorMinIO

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Severity
HIGH7.1
Exploit prediction
EPSS 0.1%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

MinIO· Minio
95%
v < 2026-03-26t21-24-40zv < RELEASE.2026-03-26T21-24-40Z
Affected range stops below 2026-03-26t21-24-40z, so it looks safe — our inference, not a vendor statement
Affected range stops below RELEASE.2026-03-26T21-24-40Z, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

x_refsource_CONFIRMVendor Advisory
Source: cverecord
https://github.com/minio/minio/security/advisories/GHSA-3rh2-v3gr-35p9

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.1HIGHGitHub_M
Vector?

Quick Info

StatusANALYZED
CWE
CWE-287

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