{ "document": { "category": "csaf_base", "csaf_version": "2.0", "distribution": { "tlp": { "label": "WHITE" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this portal to enhance access to its information and vulnerabilities. The use of this information is subject to the following terms and conditions:\n\nThe vulnerabilities disclosed in this portal are gathered by NCSC-NL from a variety of open sources, which the user can retrieve from other platforms. NCSC-NL makes every reasonable effort to ensure that the content of this portal is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or real-time keeping up-to-date. NCSC-NL does not control nor guarantee the accuracy, relevance, timeliness or completeness of information obtained from these external sources. The vulnerabilities disclosed in this portal are intended solely for the convenience of professional parties to take appropriate measures to manage the risks posed to the cybersecurity. No rights can be derived from the information provided therein.\n\nNCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of the vulnerabilities disclosed in this portal. This includes damage resulting from the inaccuracy of incompleteness of the information contained in it.\nThe information on this page is subject to Dutch law. All disputes related to or arising from the use of this portal regarding the disclosure of vulnerabilities will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings." } ], "publisher": { "category": "coordinator", "contact_details": "cert@ncsc.nl", "name": "National Cyber Security Centre", "namespace": "https://www.ncsc.nl/" }, "title": "CVE-2026-27607", "tracking": { "current_release_date": "2026-03-27T20:41:08.917688Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-27607", "initial_release_date": "2026-02-25T03:24:49.631627Z", "revision_history": [ { "date": "2026-02-25T03:24:49.631627Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (1).| CWES updated (1)." }, { "date": "2026-02-25T03:24:56.175931Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-02-25T03:38:48.805635Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (1).| References created (1).| CWES updated (1)." }, { "date": "2026-02-25T03:38:59.313966Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-02-25T07:35:27.043154Z", "number": "5", "summary": "NCSC Score updated." }, { "date": "2026-02-25T15:13:49.908394Z", "number": "6", "summary": "Source created.| CVE status created. (valid)| EPSS created." }, { "date": "2026-02-25T15:13:51.426279Z", "number": "7", "summary": "NCSC Score updated." }, { "date": "2026-02-25T16:29:08.903923Z", "number": "8", "summary": "Products connected (26).| Product Identifiers created (27).| Products created (1)." }, { "date": "2026-02-25T16:29:16.941182Z", "number": "9", "summary": "NCSC Score updated." }, { "date": "2026-02-25T20:38:50.772394Z", "number": "10", "summary": "Unknown change." }, { "date": "2026-02-25T22:39:46.710958Z", "number": "11", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (4).| CWES updated (1)." }, { "date": "2026-02-25T22:39:58.373634Z", "number": "12", "summary": "NCSC Score updated." }, { "date": "2026-02-26T00:31:54.755404Z", "number": "13", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (27).| References created (3).| CWES updated (1)." }, { "date": "2026-03-20T09:40:33.913002Z", "number": "14", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-20T09:40:36.331913Z", "number": "15", "summary": "NCSC Score updated." }, { "date": "2026-03-27T19:49:19.367109Z", "number": "16", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (2).| References created (5).| CWES updated (1)." } ], "status": "interim", "version": "16" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/1.0.0-alpha.83", "product": { "name": "vers:unknown/1.0.0-alpha.83", "product_id": "CSAFPID-5944656" } }, { "category": "product_version_range", "name": "vers:unknown/>=1.0.0-alpha.56|<1.0.0-alpha.83", "product": { "name": "vers:unknown/>=1.0.0-alpha.56|<1.0.0-alpha.83", "product_id": "CSAFPID-5944657" } } ], "category": "product_name", "name": "cargo/rustfs" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/1.0.0-alpha.56", "product": { "name": "vers:unknown/1.0.0-alpha.56", "product_id": "CSAFPID-5314976" } }, { "category": "product_version_range", "name": "vers:unknown/1.0.0-alpha.57", "product": { "name": "vers:unknown/1.0.0-alpha.57", "product_id": "CSAFPID-5314977" } }, { "category": "product_version_range", "name": "vers:unknown/1.0.0-alpha.58", "product": { "name": "vers:unknown/1.0.0-alpha.58", "product_id": "CSAFPID-5314978" } }, { "category": "product_version_range", "name": "vers:unknown/1.0.0-alpha.59", "product": { "name": "vers:unknown/1.0.0-alpha.59", "product_id": "CSAFPID-5314979" } }, { "category": "product_version_range", "name": "vers:unknown/1.0.0-alpha.60", "product": { "name": "vers:unknown/1.0.0-alpha.60", "product_id": "CSAFPID-5314981" } }, { "category": "product_version_range", "name": "vers:unknown/1.0.0-alpha.61", "product": { "name": "vers:unknown/1.0.0-alpha.61", "product_id": "CSAFPID-5314982" } }, { "category": "product_version_range", "name": "vers:unknown/1.0.0-alpha.62", "product": { "name": "vers:unknown/1.0.0-alpha.62", "product_id": "CSAFPID-5314983" } }, { "category": "product_version_range", "name": "vers:unknown/1.0.0-alpha.63", "product": { "name": "vers:unknown/1.0.0-alpha.63", 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"product": { "name": "vers:unknown/1.0.0-alpha66", "product_id": "CSAFPID-5435719", "product_identification_helper": { "cpe": "cpe:2.3:a:rustfs:rustfs:1.0.0:alpha66:*:*:*:rust:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/1.0.0-alpha67", "product": { "name": "vers:unknown/1.0.0-alpha67", "product_id": "CSAFPID-5435720", "product_identification_helper": { "cpe": "cpe:2.3:a:rustfs:rustfs:1.0.0:alpha67:*:*:*:rust:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/1.0.0-alpha68", "product": { "name": "vers:unknown/1.0.0-alpha68", "product_id": "CSAFPID-5435721", "product_identification_helper": { "cpe": "cpe:2.3:a:rustfs:rustfs:1.0.0:alpha68:*:*:*:rust:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/1.0.0-alpha69", "product": { "name": "vers:unknown/1.0.0-alpha69", "product_id": "CSAFPID-5435722", "product_identification_helper": { "cpe": "cpe:2.3:a:rustfs:rustfs:1.0.0:alpha69:*:*:*:rust:*:*" } } }, { "category": 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"CSAFPID-5435731", "product_identification_helper": { "cpe": "cpe:2.3:a:rustfs:rustfs:1.0.0:alpha77:*:*:*:rust:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/1.0.0-alpha78", "product": { "name": "vers:unknown/1.0.0-alpha78", "product_id": "CSAFPID-5435732", "product_identification_helper": { "cpe": "cpe:2.3:a:rustfs:rustfs:1.0.0:alpha78:*:*:*:rust:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/1.0.0-alpha79", "product": { "name": "vers:unknown/1.0.0-alpha79", "product_id": "CSAFPID-5585906", "product_identification_helper": { "cpe": "cpe:2.3:a:rustfs:rustfs:1.0.0:alpha79:*:*:*:rust:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/1.0.0-alpha80", "product": { "name": "vers:unknown/1.0.0-alpha80", "product_id": "CSAFPID-5674760", "product_identification_helper": { "cpe": "cpe:2.3:a:rustfs:rustfs:1.0.0:alpha80:*:*:*:rust:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/1.0.0-alpha81", "product": { "name": "vers:unknown/1.0.0-alpha81", "product_id": "CSAFPID-5674761", "product_identification_helper": { "cpe": "cpe:2.3:a:rustfs:rustfs:1.0.0:alpha81:*:*:*:rust:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/1.0.0-alpha82", "product": { "name": "vers:unknown/1.0.0-alpha82", "product_id": "CSAFPID-5703814", "product_identification_helper": { "cpe": "cpe:2.3:a:rustfs:rustfs:1.0.0:alpha82:*:*:*:rust:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/>=1.0.0-alpha.56|<1.0.0-alpha.83", "product": { "name": "vers:unknown/>=1.0.0-alpha.56|<1.0.0-alpha.83", "product_id": "CSAFPID-5700849" } } ], "category": "product_name", "name": "rustfs" } ], "category": "vendor", "name": "rustfs" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-27607", "cwe": { "id": "CWE-863", "name": "Incorrect Authorization" }, "notes": [ { "category": "description", "text": "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.", "title": "nvd - https://nvd.nist.gov/vuln/detail/CVE-2026-27607" }, { "category": "description", "text": "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.", "title": "cveprojectv5 - https://www.cve.org/CVERecord?id=CVE-2026-27607" }, { "category": "description", "text": "### Summary\nRustFS 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.\n\n### Details\nWhen generating presigned POST URLs via the AWS SDK, applications can specify policy conditions to restrict uploads. RustFS accepts these presigned requests but fails to validate the following conditions server-side:\n\n1. `content-length-range` not enforced: The server does not verify that the uploaded file size falls within the specified minimum and maximum bounds. An attacker can upload arbitrarily large files despite restrictions.\n2. `starts-with` not enforced: The server does not validate that the object key matches the required prefix. An attacker can modify the key field to upload files to any path in the bucket.\n3. `Content-Type` (exact match) not enforced: The server does not verify that the uploaded file's content type matches the policy constraint. An attacker can upload files with any content type.\n\nThe vulnerability exists in the PostObject endpoint implementation, where the signed policy conditions are not parsed and validated against the actual upload request.\n\n### Impact\nVulnerability Type: Improper Input Validation / Authorization Bypass\n##### Who is affected:\nAny application using RustFS as an S3-compatible backend that relies on presigned POST policy conditions for access control or upload restrictions.\n##### Potential attack scenarios:\n1. Storage Exhaustion / Denial of Service: Attackers can upload arbitrarily large files, bypassing size limits, potentially filling up disk space and causing service outages.\n2. Unauthorized Data Access/Modification: By bypassing starts-with conditions, attackers can upload files to restricted paths (e.g., overwriting configuration files, accessing other users' directories in multi-tenant systems).\n3. Content-Type Spoofing: Bypassing content-type restrictions could enable serving malicious content (e.g., HTML/JavaScript files in contexts expecting only images), potentially leading to XSS attacks if files are served to browsers.\n\n**Severity**: The vulnerability allows complete bypass of server-enforced upload policies, undermining the security model that applications rely upon.", "title": "github - https://github.com/advisories/GHSA-w5fh-f8xh-5x3p" }, { "category": "description", "text": "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.", "title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/GIT%2FCVE-2026-27607.json?alt=media" }, { "category": "description", "text": "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.", "title": "gitlab - https://gitlab.com/api/v4/projects/25847700/repository/files/cargo%2Frustfs%2FCVE-2026-27607.yml/raw" }, { "category": "other", "text": "0.00091", "title": "EPSS" }, { "category": "other", "text": "4.5", "title": "NCSC Score" }, { "category": "other", "text": "Is related to CWE-863 (Incorrect Authorization)", "title": "NCSC Score top increasing factors" }, { "category": "other", "text": "Is related to CWE-434 (Unrestricted Upload of File with Dangerous Type), The value of the most recent EPSS score", "title": "NCSC Score top decreasing factors" } ], "product_status": { "fixed": [ "CSAFPID-5944656" ], "known_affected": [ "CSAFPID-5700849", "CSAFPID-5435708", "CSAFPID-5435709", "CSAFPID-5435710", "CSAFPID-5435711", "CSAFPID-5435713", "CSAFPID-5435714", "CSAFPID-5435715", "CSAFPID-5435716", "CSAFPID-5435717", "CSAFPID-5435718", "CSAFPID-5435719", "CSAFPID-5435720", "CSAFPID-5435721", "CSAFPID-5435722", "CSAFPID-5435724", "CSAFPID-5435725", "CSAFPID-5435726", "CSAFPID-5435727", "CSAFPID-5435728", "CSAFPID-5435729", "CSAFPID-5435730", "CSAFPID-5435731", "CSAFPID-5435732", "CSAFPID-5585906", "CSAFPID-5674760", "CSAFPID-5674761", "CSAFPID-5703814", "CSAFPID-5314976", "CSAFPID-5314977", "CSAFPID-5314978", "CSAFPID-5314979", "CSAFPID-5314981", "CSAFPID-5314982", "CSAFPID-5314983", "CSAFPID-5314984", "CSAFPID-5314985", "CSAFPID-5314986", "CSAFPID-5314987", "CSAFPID-5314988", "CSAFPID-5314989", "CSAFPID-5314990", "CSAFPID-5314992", "CSAFPID-5314993", "CSAFPID-5314994", "CSAFPID-5314995", "CSAFPID-5314996", "CSAFPID-5314997", "CSAFPID-5314998", "CSAFPID-5335924", "CSAFPID-5347856", "CSAFPID-5440712", "CSAFPID-5713781", "CSAFPID-5713782", "CSAFPID-5713783", "CSAFPID-5944657" ] }, "references": [ { "category": "external", "summary": "Source - nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27607" }, { "category": "external", "summary": "Source raw - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-27607" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://www.cve.org/CVERecord?id=CVE-2026-27607" }, { "category": "external", "summary": "Source raw - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/27xxx/CVE-2026-27607.json" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-27607" }, { "category": "external", "summary": "Source raw - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - github", "url": "https://github.com/advisories/GHSA-w5fh-f8xh-5x3p" }, { "category": "external", "summary": "Source raw - github", "url": "https://api.github.com/advisories/GHSA-w5fh-f8xh-5x3p" }, { "category": "external", "summary": "Source - osv", "url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/GIT%2FCVE-2026-27607.json?alt=media" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - gitlab", "url": "https://gitlab.com/api/v4/projects/25847700/repository/files/cargo%2Frustfs%2FCVE-2026-27607.yml/raw" }, { "category": "external", "summary": "Reference - cveprojectv5; github; gitlab; nvd; osv", "url": "https://github.com/rustfs/rustfs/security/advisories/GHSA-w5fh-f8xh-5x3p" }, { "category": "external", "summary": "Reference - github; gitlab; osv", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27607" }, { "category": "external", "summary": "Reference - github; gitlab", "url": "https://github.com/rustfs/rustfs/releases/tag/1.0.0-alpha.83" }, { "category": "external", "summary": "Reference - github; gitlab", "url": "https://github.com/advisories/GHSA-w5fh-f8xh-5x3p" }, { "category": "external", "summary": "Reference - osv", "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27607.json" }, { "category": "external", "summary": "Reference - gitlab", "url": "https://github.com/rustfs/rustfs" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H", "baseScore": 8.1, "baseSeverity": "HIGH" }, "products": [ "CSAFPID-5314976", "CSAFPID-5314977", "CSAFPID-5314978", "CSAFPID-5314979", "CSAFPID-5314981", "CSAFPID-5314982", "CSAFPID-5314983", "CSAFPID-5314984", "CSAFPID-5314985", "CSAFPID-5314986", "CSAFPID-5314987", "CSAFPID-5314988", "CSAFPID-5314989", "CSAFPID-5314990", "CSAFPID-5314992", "CSAFPID-5314993", "CSAFPID-5314994", "CSAFPID-5314995", "CSAFPID-5314996", "CSAFPID-5314997", "CSAFPID-5314998", "CSAFPID-5335924", "CSAFPID-5347856", "CSAFPID-5435708", "CSAFPID-5435709", "CSAFPID-5435710", "CSAFPID-5435711", "CSAFPID-5435713", "CSAFPID-5435714", "CSAFPID-5435715", "CSAFPID-5435716", "CSAFPID-5435717", "CSAFPID-5435718", "CSAFPID-5435719", "CSAFPID-5435720", "CSAFPID-5435721", "CSAFPID-5435722", "CSAFPID-5435724", "CSAFPID-5435725", "CSAFPID-5435726", "CSAFPID-5435727", "CSAFPID-5435728", "CSAFPID-5435729", "CSAFPID-5435730", "CSAFPID-5435731", "CSAFPID-5435732", "CSAFPID-5440712", "CSAFPID-5585906", "CSAFPID-5674760", "CSAFPID-5674761", "CSAFPID-5700849", "CSAFPID-5703814", "CSAFPID-5713781", "CSAFPID-5713782", "CSAFPID-5713783", "CSAFPID-5944657" ] } ], "title": "CVE-2026-27607" } ] }