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    "cveMetadata": {
        "cveId": "CVE-2026-97731",
        "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "state": "PUBLISHED",
        "assignerShortName": "mitre",
        "dateReserved": "2026-09-25T03:07:29.873Z",
        "datePublished": "2026-09-25T03:07:30.661Z",
        "dateUpdated": "2026-09-25T15:22:53.901Z"
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                    "defaultStatus": "unaffected",
                    "product": "MinIO",
                    "repo": "https://github.com/minio/minio",
                    "vendor": "MinIO",
                    "versions": [
                        {
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                            "status": "affected",
                            "version": "0",
                            "versionType": "git"
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            "descriptions": [
                {
                    "lang": "en",
                    "value": "MinIO through 7aac2a2 does not verify that every x-amz-* header present on a request also appears in the client-supplied X-Amz-SignedHeaders list. extractSignedHeaders() in cmd/signature-v4-utils.go iterates only the claimed list and never enumerates the headers that actually arrived, and thus a header that arrives unsigned is neither hashed into the canonical request nor rejected. Because cmd/api-router.go dispatches CopyObject on the presence of x-amz-copy-source alone, the holder of a presigned PUT URL scoped to a single object can add that header to the unmodified URL and cause a server-side copy, executed as the signer, of any object the signing key can read. A grant to write one object becomes a read of every bucket that key can reach. Amazon S3 rejects the equivalent request with HTTP 403 AccessDenied. The minio/minio GitHub repository was archived in April 2026; pgsty/silo before 1233254 is also affected."
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "attackComplexity": "LOW",
                        "attackVector": "NETWORK",
                        "availabilityImpact": "NONE",
                        "baseScore": 7.1,
                        "baseSeverity": "HIGH",
                        "confidentialityImpact": "HIGH",
                        "integrityImpact": "LOW",
                        "privilegesRequired": "LOW",
                        "scope": "UNCHANGED",
                        "userInteraction": "NONE",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N",
                        "version": "3.1"
                    },
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                            "value": "GENERAL"
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            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-347",
                            "description": "CWE-347 Improper Verification of Cryptographic Signature",
                            "lang": "en",
                            "type": "CWE"
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                "dateUpdated": "2026-09-25T03:07:30.661Z"
            },
            "references": [
                {
                    "url": "https://silo.pgsty.com/about/security-advisories/#sn-2026-011"
                },
                {
                    "url": "https://github.com/pgsty/silo/commit/1233254309b15571f101b2b26d531951ceaeef1e"
                }
            ],
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                                    "vulnerable": true,
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        "adp": [
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                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-09-25T15:22:42.586752Z",
                                "id": "CVE-2026-97731",
                                "options": [
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                                        "Exploitation": "none"
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