CVE-2026-34204: MinIO is Vulnerable to SSE Metadata Injection via Replication Headers
Vulnerability summary
CVE-2026-34204 is a high (CVSS 7.1) Improper Authentication vulnerability in minio. EPSS estimates a 0.21% chance of exploitation in the next 30 days, higher than 10.4% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 2 · Related 3Timeline
- 31-03-2026PublishedVulnerability first disclosed.
- 01-04-2026Last modifiedVulnerability information updated.
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
9 scores · 5 sources · 2 versions- OSV · WolfiEcosystem advisory · calculated7.1HighCVSS: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 · GoEcosystem advisory · calculated7.1HighCVSS: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 · ChainguardEcosystem advisory · calculated7.1HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
- NVDNIST7.1HighCVSS: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
- OSV · GoEcosystem advisory · calculated7.1HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
- OSV · ChainguardEcosystem advisory · calculated7.1HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
- NVDNIST7.1HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
EPSS trend
Probability
0.21%
Chance of exploitation in the next 30 days
Percentile
10%
Versus all other CVEs
30-day change
Increase +0.08 pp
From 0.12% on 22-09-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Chainguard2 products
- minio< 0.20260504.002721-r0
- minio-iamguarded-2025-compat< 0.20260504.002721-r0
Wolfi2 products
- minio< 0.20260504.002721-r0
- minio-iamguarded-2025-compat< 0.20260504.002721-r0
Github.com/minio1 product
- minio≥ 0.0.0-20240328174456-468a9fae83e9, ≤ 0.0.0-20260212201848-7aac2a2c5b7c | ≥ 0.0.0-20240328174456-468a9fae83e9 (No fix recorded)
Minio1 product
- minio< RELEASE.2026-03-26T21-24-40Z | < 2026-03-26t21-24-40z
4 vendors · 6 products
References
4 links- github.com/minio/minio/security/advisories/GHSA-3rh2-v3gr-35p9X Refsource CONFIRMWEBAdvisoryVendor Advisory
- github.com/minio/minioPACKAGE