{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-27607", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-02-20T19:43:14.602Z", "datePublished": "2026-02-25T02:10:28.086Z", "dateUpdated": "2026-02-25T02:10:28.086Z"}, "containers": {"cna": {"title": "RustFS's Missing Post Policy Validation leads to Arbitrary Object Write", "problemTypes": [{"descriptions": [{"cweId": "CWE-20", "lang": "en", "description": "CWE-20: Improper Input Validation", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-863", "lang": "en", "description": "CWE-863: Incorrect Authorization", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H", "version": "3.1"}}], "references": [{"name": "https://github.com/rustfs/rustfs/security/advisories/GHSA-w5fh-f8xh-5x3p", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/rustfs/rustfs/security/advisories/GHSA-w5fh-f8xh-5x3p"}], "affected": [{"vendor": "rustfs", "product": "rustfs", "versions": [{"version": ">= 1.0.0-alpha.56, < 1.0.0-alpha.83", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-02-25T02:10:28.086Z"}, "descriptions": [{"lang": "en", "value": "RustFS is a distributed object storage system built in Rust. In versions 1.0.0-alpha.56 through 1.0.0-alpha.82, RustFS does not validate policy conditions in presigned POST uploads (PostObject), allowing attackers to bypass content-length-range, starts-with, and Content-Type constraints. This enables unauthorized file uploads exceeding size limits, uploads to arbitrary object keys, and content-type spoofing, potentially leading to storage exhaustion, unauthorized data access, and security bypasses. Version 1.0.0-alpha.83 fixes the issue."}], "source": {"advisory": "GHSA-w5fh-f8xh-5x3p", "discovery": "UNKNOWN"}}}}

{}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:rustfs:rustfs:1.0.0:alpha56:*:*:*:rust:*:*", "matchCriteriaId": "5BE55B7E-3806-4F8A-B09C-7B9D173D3FAE", "vulnerable": true}, {"criteria": "cpe:2.3:a:rustfs:rustfs:1.0.0:alpha57:*:*:*:rust:*:*", "matchCriteriaId": "8CF07DA6-11F6-4A19-9FD9-1955EC22C779", "vulnerable": true}, {"criteria": "cpe:2.3:a:rustfs:rustfs:1.0.0:alpha58:*:*:*:rust:*:*", "matchCriteriaId": "1A571B98-0EE7-46A6-8514-3E02F9CE969A", "vulnerable": true}, {"criteria": "cpe:2.3:a:rustfs:rustfs:1.0.0:alpha59:*:*:*:rust:*:*", "matchCriteriaId": "3263EEC7-94FF-4802-BCB2-0C3713079439", "vulnerable": true}, {"criteria": "cpe:2.3:a:rustfs:rustfs:1.0.0:alpha60:*:*:*:rust:*:*", "matchCriteriaId": "FA13E6EE-A889-408E-8503-2F57A5E46CE1", "vulnerable": true}, {"criteria": "cpe:2.3:a:rustfs:rustfs:1.0.0:alpha61:*:*:*:rust:*:*", "matchCriteriaId": "4D28A63E-ADE5-4DEC-8E75-0884A7011613", "vulnerable": true}, {"criteria": "cpe:2.3:a:rustfs:rustfs:1.0.0:alpha62:*:*:*:rust:*:*", "matchCriteriaId": "21E6129E-565C-45AE-A0C8-2D1B623EEC9D", "vulnerable": true}, {"criteria": "cpe:2.3:a:rustfs:rustfs:1.0.0:alpha63:*:*:*:rust:*:*", "matchCriteriaId": "046F640C-18E9-4FC4-812D-8E4CAAFCAE55", "vulnerable": true}, {"criteria": "cpe:2.3:a:rustfs:rustfs:1.0.0:alpha64:*:*:*:rust:*:*", "matchCriteriaId": "BFB217B7-78AA-4D16-9A2B-863BD6CD01B6", "vulnerable": true}, {"criteria": "cpe:2.3:a:rustfs:rustfs:1.0.0:alpha65:*:*:*:rust:*:*", "matchCriteriaId": "F8EEF3FF-410B-40F3-A144-CD61ED394109", "vulnerable": true}, {"criteria": "cpe:2.3:a:rustfs:rustfs:1.0.0:alpha66:*:*:*:rust:*:*", "matchCriteriaId": "E3494138-7FE7-4152-935C-C1C35179064B", "vulnerable": true}, {"criteria": "cpe:2.3:a:rustfs:rustfs:1.0.0:alpha67:*:*:*:rust:*:*", "matchCriteriaId": "9E0461BC-0E45-4F9F-A837-4D9FC8852A75", "vulnerable": true}, {"criteria": "cpe:2.3:a:rustfs:rustfs:1.0.0:alpha68:*:*:*:rust:*:*", "matchCriteriaId": "E259407D-61CF-4956-A456-57F131334456", "vulnerable": true}, {"criteria": "cpe:2.3:a:rustfs:rustfs:1.0.0:alpha69:*:*:*:rust:*:*", "matchCriteriaId": "B6E44EF8-98A5-47F5-B7E9-3199EB08FAC1", "vulnerable": true}, {"criteria": "cpe:2.3:a:rustfs:rustfs:1.0.0:alpha70:*:*:*:rust:*:*", "matchCriteriaId": "F4CBBD85-02F9-491A-8845-59EFB88F2DAF", "vulnerable": true}, {"criteria": "cpe:2.3:a:rustfs:rustfs:1.0.0:alpha71:*:*:*:rust:*:*", "matchCriteriaId": "2271380A-3AE1-4954-8D16-5065C8E88D32", "vulnerable": true}, {"criteria": "cpe:2.3:a:rustfs:rustfs:1.0.0:alpha72:*:*:*:rust:*:*", "matchCriteriaId": "DB3F6C7E-71E4-427A-96F4-F62DE0ED9450", "vulnerable": true}, {"criteria": "cpe:2.3:a:rustfs:rustfs:1.0.0:alpha73:*:*:*:rust:*:*", "matchCriteriaId": "980BEAAE-143E-4F28-9A2F-58CED3D296E9", "vulnerable": true}, {"criteria": "cpe:2.3:a:rustfs:rustfs:1.0.0:alpha74:*:*:*:rust:*:*", "matchCriteriaId": "8E14C88E-CE9B-44DA-98DE-280C0D6E4C8D", "vulnerable": true}, {"criteria": "cpe:2.3:a:rustfs:rustfs:1.0.0:alpha75:*:*:*:rust:*:*", "matchCriteriaId": "EEC13614-61AD-45A7-B7FA-07346D33CACF", "vulnerable": true}, {"criteria": "cpe:2.3:a:rustfs:rustfs:1.0.0:alpha76:*:*:*:rust:*:*", "matchCriteriaId": "6B3E9EB0-0A41-4146-B6A9-49B1A70358DC", "vulnerable": true}, {"criteria": "cpe:2.3:a:rustfs:rustfs:1.0.0:alpha77:*:*:*:rust:*:*", "matchCriteriaId": "CBDD75C5-1A08-4758-9324-172C1D539322", "vulnerable": true}, {"criteria": "cpe:2.3:a:rustfs:rustfs:1.0.0:alpha78:*:*:*:rust:*:*", "matchCriteriaId": "96461CC0-012C-40D7-B1CB-FF9A6B7EB644", "vulnerable": true}, {"criteria": "cpe:2.3:a:rustfs:rustfs:1.0.0:alpha79:*:*:*:rust:*:*", "matchCriteriaId": "9AA7AE2E-83E3-4796-8569-16030DB2CF38", "vulnerable": true}, {"criteria": "cpe:2.3:a:rustfs:rustfs:1.0.0:alpha80:*:*:*:rust:*:*", "matchCriteriaId": "73638EAF-BCA6-4BD8-90E5-3A53EFD0FD5C", "vulnerable": true}, {"criteria": "cpe:2.3:a:rustfs:rustfs:1.0.0:alpha81:*:*:*:rust:*:*", "matchCriteriaId": "48BCB4A7-57C5-4FAA-860D-B862947EE352", "vulnerable": true}, {"criteria": "cpe:2.3:a:rustfs:rustfs:1.0.0:alpha82:*:*:*:rust:*:*", "matchCriteriaId": "0EA73A06-6AEA-45DF-B819-D25AA9BBEBA7", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "RustFS is a distributed object storage system built in Rust. In versions 1.0.0-alpha.56 through 1.0.0-alpha.82, RustFS does not validate policy conditions in presigned POST uploads (PostObject), allowing attackers to bypass content-length-range, starts-with, and Content-Type constraints. This enables unauthorized file uploads exceeding size limits, uploads to arbitrary object keys, and content-type spoofing, potentially leading to storage exhaustion, unauthorized data access, and security bypasses. Version 1.0.0-alpha.83 fixes the issue."}], "id": "CVE-2026-27607", "lastModified": "2026-02-25T15:37:08.497", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.2, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.1, "baseSeverity": "CRITICAL", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.2, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2026-02-25T03:16:04.787", "references": [{"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://github.com/rustfs/rustfs/security/advisories/GHSA-w5fh-f8xh-5x3p"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-20"}, {"lang": "en", "value": "CWE-863"}], "source": "security-advisories@github.com", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-863"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.0.0-alpha.56,1.0.0-alpha.83)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "rustfs", "source": "cna", "vendor": "rustfs"}, "product": "rustfs", "vendor": "rustfs"}], "created": "2026-02-25T11:35:06.385744+00:00", "updated": "2026-02-25T11:35:06.385816+00:00", "vendors": ["rustfs", "rustfs$PRODUCT$rustfs"]}