CVE-2026-27607— RustFS's Missing Post Policy Validation leads to Arbitrary Object Write
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I. Basic Information for CVE-2026-27607
Vulnerability Information
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Vulnerability Title
RustFS's Missing Post Policy Validation leads to Arbitrary Object Write
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
输入验证不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
rustfs 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
rustfs是RustFS开源的一个高性能对象存储系统。 rustfs 1.0.0-alpha.56至1.0.0-alpha.82版本存在安全漏洞，该漏洞源于未验证预签名POST上传中的策略条件，可能导致绕过内容长度范围、起始条件和内容类型约束，进而导致未经授权的文件上传。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-27607
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IV. Related Vulnerabilities
Same product: rustfs
- CVE-2026-40937
RustFS missing admin authorization on notification target en - CVE-2026-39360
RustFS has an authorization bypass in multipart UploadPartCo - CVE-2026-27822
Rust has Critical Stored XSS in Preview Modal, leading to Ad - CVE-2026-24762
RustFS Logs Sensitive Credentials in Plaintext - CVE-2026-21862
RustFS sourceIp bypass via spoofed X-Forwarded-For/Real-IP h
Same vendor: rustfs
- CVE-2026-40937
RustFS missing admin authorization on notification target en - CVE-2026-39360
RustFS has an authorization bypass in multipart UploadPartCo - CVE-2026-27822
Rust has Critical Stored XSS in Preview Modal, leading to Ad - CVE-2026-24762
RustFS Logs Sensitive Credentials in Plaintext - CVE-2026-21862
RustFS sourceIp bypass via spoofed X-Forwarded-For/Real-IP h
Same weakness: CWE-20
V. Comments for CVE-2026-27607
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