Vulnerability · Published Mar 31, 2026 · Assigned by GitHub_M

CVE-2026-34204MinIO is Vulnerable to SSE Metadata Injection via Replication Headers

High 7.1

In plain English

A high-severity improper authentication in minio from minio. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities).

Severity (CVSS 4.0)7.1High

Exploit odds (30 days)0.1%top 97.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/minio/minio	no fix listed	GHSA-3rh2-v3gr-35p9
Go	github.com/minio/minio	no fix listed	GO-2026-4896

Affected products (as reported)

Vendor	Product	Versions
minio	minio	< RELEASE.2026-03-26T21-24-40Z

Weakness: CWE-287 · 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

References

https://github.com/minio/minio/security/advisories/GHSA-3rh2-v3gr-35p9 x_refsource_CONFIRM