{"dataType": "CVE_RECORD", "dataVersion": "5.2", "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": "2026-09-25T03:07:30.661Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "product": "MinIO", "repo": "https://github.com/minio/minio", "vendor": "MinIO", "versions": [{"lessThanOrEqual": "7aac2a2c5b7c882e68c1ce017d8256be2feea27f", "status": "affected", "version": "0", "versionType": "git"}]}], "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"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-347", "description": "CWE-347 Improper Verification of Cryptographic Signature", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "shortName": "mitre", "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"}], "x_generator": {"engine": "CVE-Request-form 0.0.1"}, "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:minio:minio:*:*:*:*:*:*:*:*", "versionEndIncluding": "7aac2a2c5b7c882e68c1ce017d8256be2feea27f"}]}]}]}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "MinIO", "repo": "https://github.com/minio/minio", "vendor": "MinIO", "versions": [{"lessThanOrEqual": "7aac2a2c5b7c882e68c1ce017d8256be2feea27f", "status": "affected", "version": "0", "versionType": "git"}]}], "source": "cve@mitre.org"}], "cveTags": [], "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."}], "id": "CVE-2026-97731", "lastModified": "2026-09-25T03:16:59.697", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 2.8, "impactScore": 4.2, "source": "cve@mitre.org", "type": "Secondary"}]}, "published": "2026-09-25T03:16:59.697", "references": [{"source": "cve@mitre.org", "url": "https://github.com/pgsty/silo/commit/1233254309b15571f101b2b26d531951ceaeef1e"}, {"source": "cve@mitre.org", "url": "https://silo.pgsty.com/about/security-advisories/#sn-2026-011"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-347"}], "source": "cve@mitre.org", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,7aac2a2c5b7c882e68c1ce017d8256be2feea27f]"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "MinIO", "source": "cna", "vendor": "MinIO"}, "product": "minio", "vendor": "minio"}], "created": "2026-09-25T08:00:12.780090+00:00", "title": "Unsigned X\u2011Amz\u2011Headers Enable Server\u2011Side Copy via Presigned PUT URLs in MinIO", "updated": "2026-09-25T09:30:07.399025+00:00", "vendors": ["minio", "minio$PRODUCT$minio"]}