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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Chainguard MinIO unaffected
Version Status Constraints
0 affected ≤ RELEASE.2026-09-21T00-15-41Z

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Project Subscriptions

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/chainguard-forks/minio/security/advisories/GHSA-48rv-pgqh-mhjg cve-icon cve-icon
History

Thu, 05 Nov 2026 23:45:00 +0000

Type Values Removed Values Added
Title Unsigned x‑amz‑* Headers Enable Cross‑Bucket Read via Presigned PUT URL in MinIO

Thu, 05 Nov 2026 22:15:00 +0000

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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: chainguard

Published:

Updated: 2026-11-05T22:00:11.719Z

Reserved: 2026-11-04T21:51:50.367Z

Link: CVE-2026-122267

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-11-05T22:17:55.117

Modified: 2026-11-05T22:17:55.117

Link: CVE-2026-122267

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-11-05T23:30:16Z

Weaknesses