Instituto Nacional de ciberseguridad. Sección Incibe
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CVE-2026-27607

Severity CVSS v4.0:
Pending analysis
Type:
CWE-20 Input Validation
Publication date:
25/02/2026
Last modified:
25/02/2026

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.

Impact

Vector 3.x
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 8.10 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): High
Availability (A): High

Base Score 3.x
8.10
Severity 3.x
HIGH

Vulnerable products and versions

CPE From Up to
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:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools