CVE-2026-122267 - Vulnerability Details - OpenCVE

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.

Published: 2026-11-05

Score: 8.8 High

EPSS: n/a

KEV: No

Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

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

No data.

No data.

No data available yet.

Remediation

No vendor fix or workaround currently provided.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

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.

References

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

History

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		https://github.com/chainguard-forks/minio/security/advisories/GHSA-48rv-pgqh-mhjg
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'}`

Subscriptions

No data.

MITRE

Status: PUBLISHED

Assigner: chainguard

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

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

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

Link: CVE-2026-122267

Vulnrichment

No data.

NVD

Status : Received

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

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

Link: CVE-2026-122267

Redhat

No data.

OpenCVE Enrichment

No data.

Weaknesses

CWE-347
Improper Verification of Cryptographic Signature

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-122267", "assignerOrgId": "82cea9a6-e9e3-46fe-bdb0-3673de380178", "state": "PUBLISHED", "assignerShortName": "chainguard", "dateReserved": "2026-11-04T21:51:50.367Z", "datePublished": "2026-11-05T22:00:11.719Z", "dateUpdated": "2026-11-05T22:00:11.719Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "82cea9a6-e9e3-46fe-bdb0-3673de380178", "shortName": "chainguard", "dateUpdated": "2026-11-05T22:00:11.719Z"}, "datePublic": "2026-11-05T21:43:00.000Z", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-347", "description": "CWE-347 Improper verification of cryptographic signature", "type": "CWE"}]}], "impacts": [{"descriptions": [{"lang": "en", "value": "Unauthorized cross-bucket data access and modification"}]}], "affected": [{"vendor": "Chainguard", "product": "MinIO", "versions": [{"status": "affected", "version": "0", "lessThanOrEqual": "RELEASE.2026-09-21T00-15-41Z", "versionType": "custom"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "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.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<h1>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.</h1>"}]}], "references": [{"url": "https://github.com/chainguard-forks/minio/security/advisories/GHSA-48rv-pgqh-mhjg"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "HIGH", "baseScore": 8.8, "vectorString": "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"}}], "credits": [{"lang": "en", "value": "Oren Yomtov of Act Security", "type": "finder"}], "source": {"discovery": "UNKNOWN"}, "x_generator": {"engine": "Vulnogram 1.0.5"}}}}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "MinIO", "vendor": "Chainguard", "versions": [{"lessThanOrEqual": "RELEASE.2026-09-21T00-15-41Z", "status": "affected", "version": "0", "versionType": "custom"}]}], "source": "82cea9a6-e9e3-46fe-bdb0-3673de380178"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-122267", "lastModified": "2026-11-05T22:17:55.117", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "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/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", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "82cea9a6-e9e3-46fe-bdb0-3673de380178", "type": "Secondary"}]}, "published": "2026-11-05T22:17:55.117", "references": [{"source": "82cea9a6-e9e3-46fe-bdb0-3673de380178", "url": "https://github.com/chainguard-forks/minio/security/advisories/GHSA-48rv-pgqh-mhjg"}], "sourceIdentifier": "82cea9a6-e9e3-46fe-bdb0-3673de380178", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-347"}], "source": "82cea9a6-e9e3-46fe-bdb0-3673de380178", "type": "Secondary"}]}