CVE-2026-122267

Unsigned x‑amz‑* Headers Enable Cross‑Bucket Read via Presigned PUT URL in MinIO

Published Nov 5, 2026 CVSS 4.0 · 8.8 High EPSS < 1% KEV · Not listed
Description
MinIO Signature V4 verification before RELEASE.2026-09-22T19-25-18Z accepts unsigned x-amz-* headers, letting a presigned PUT URL be escalated into a cross-bucket read.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Chainguard
Chainguard minio
Vendors & Products Chainguard
Chainguard minio
Type Values Removed Values Added
Title Unsigned x‑amz‑* Headers Enable Cross‑Bucket Read via Presigned PUT URL in MinIO
Type Values Removed Values Added
Description MinIO Signature V4 verification before RELEASE.2026-09-22T19-25-18Z accepts unsigned x-amz-* headers, letting a presigned PUT URL be escalated into a cross-bucket read.
Weaknesses CWE-347
References
Metrics cvssV4_0

{'score': 8.8, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
chainguard
Published
Updated
Nov 10, 2026, 2:02 PM
Reserved
Nov 4, 2026, 9:51 PM
Status
Awaiting Analysis
Published
Nov 5, 2026, 10:17 PM
Modified
Nov 12, 2026, 8:04 PM