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.
Metrics
Affected Vendors & Products
References
History
Wed, 25 Feb 2026 15:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| CPEs | cpe:2.3:a:rustfs:rustfs:1.0.0:alpha56:*:*:*:rust:*:* cpe:2.3:a:rustfs:rustfs:1.0.0:alpha57:*:*:*:rust:*:* cpe:2.3:a:rustfs:rustfs:1.0.0:alpha58:*:*:*:rust:*:* cpe:2.3:a:rustfs:rustfs:1.0.0:alpha59:*:*:*:rust:*:* cpe:2.3:a:rustfs:rustfs:1.0.0:alpha60:*:*:*:rust:*:* cpe:2.3:a:rustfs:rustfs:1.0.0:alpha61:*:*:*:rust:*:* cpe:2.3:a:rustfs:rustfs:1.0.0:alpha62:*:*:*:rust:*:* cpe:2.3:a:rustfs:rustfs:1.0.0:alpha63:*:*:*:rust:*:* cpe:2.3:a:rustfs:rustfs:1.0.0:alpha64:*:*:*:rust:*:* cpe:2.3:a:rustfs:rustfs:1.0.0:alpha65:*:*:*:rust:*:* cpe:2.3:a:rustfs:rustfs:1.0.0:alpha66:*:*:*:rust:*:* cpe:2.3:a:rustfs:rustfs:1.0.0:alpha67:*:*:*:rust:*:* cpe:2.3:a:rustfs:rustfs:1.0.0:alpha68:*:*:*:rust:*:* cpe:2.3:a:rustfs:rustfs:1.0.0:alpha69:*:*:*:rust:*:* cpe:2.3:a:rustfs:rustfs:1.0.0:alpha70:*:*:*:rust:*:* cpe:2.3:a:rustfs:rustfs:1.0.0:alpha71:*:*:*:rust:*:* cpe:2.3:a:rustfs:rustfs:1.0.0:alpha72:*:*:*:rust:*:* cpe:2.3:a:rustfs:rustfs:1.0.0:alpha73:*:*:*:rust:*:* cpe:2.3:a:rustfs:rustfs:1.0.0:alpha74:*:*:*:rust:*:* cpe:2.3:a:rustfs:rustfs:1.0.0:alpha75:*:*:*:rust:*:* cpe:2.3:a:rustfs:rustfs:1.0.0:alpha76:*:*:*:rust:*:* cpe:2.3:a:rustfs:rustfs:1.0.0:alpha77:*:*:*:rust:*:* cpe:2.3:a:rustfs:rustfs:1.0.0:alpha78:*:*:*:rust:*:* cpe:2.3:a:rustfs:rustfs:1.0.0:alpha79:*:*:*:rust:*:* cpe:2.3:a:rustfs:rustfs:1.0.0:alpha80:*:*:*:rust:*:* cpe:2.3:a:rustfs:rustfs:1.0.0:alpha81:*:*:*:rust:*:* cpe:2.3:a:rustfs:rustfs:1.0.0:alpha82:*:*:*:rust:*:* |
Wed, 25 Feb 2026 12:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Rustfs
Rustfs rustfs |
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| Vendors & Products |
Rustfs
Rustfs rustfs |
Wed, 25 Feb 2026 03:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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 | RustFS's Missing Post Policy Validation leads to Arbitrary Object Write | |
| Weaknesses | CWE-20 CWE-863 |
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| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-02-25T02:10:28.086Z
Updated: 2026-02-25T20:06:03.487Z
Reserved: 2026-02-20T19:43:14.602Z
Link: CVE-2026-27607
No data.
Status : Analyzed
Published: 2026-02-25T03:16:04.787
Modified: 2026-02-25T15:37:08.497
Link: CVE-2026-27607
No data.