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CVE-2026-45042— RustFS: UploadPartCopy Does Not Enforce Destination Bucket Policy on Copy Source

AI Predicted 8.6 Difficulty: Moderate EPSS 0.04% · P12

Possible ATT&CK Techniques 1AI

T1565.002 · Transmitted Data Manipulation

Affected Version Matrix 1

VendorProductVersion RangeStatus
rustfsrustfs< 1.0.0-beta.2affected
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I. Basic Information for CVE-2026-45042

Vulnerability Information
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Vulnerability Title
RustFS: UploadPartCopy Does Not Enforce Destination Bucket Policy on Copy Source
Source: NVD (National Vulnerability Database)
Vulnerability Description
RustFS is a distributed object storage system built in Rust. Prior to 1.0.0-beta.2, improper authorization in the UploadPartCopy operation allows copying objects across buckets without enforcing destination bucket restrictions on allowed copy sources. The implementation validates GetObject permission on the source bucket and PutObject on the destination bucket independently, but does not enforce any policy constraints on whether the destination bucket permits the specified copy source. This enables unauthorized cross-bucket data movement. This vulnerability is fixed in 1.0.0-beta.2.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
授权机制不正确
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-beta.2之前版本存在安全漏洞，该漏洞源于UploadPartCopy操作授权不当，允许跨桶复制对象而不强制目标桶的复制源限制。
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

VendorProductAffected VersionsCPESubscribe
rustfsrustfs < 1.0.0-beta.2 -

II. Public POCs for CVE-2026-45042

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III. Intelligence Information for CVE-2026-45042

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Vendor Advisories for CVE-2026-45042 (1)

Same Patch Batch · rustfs · 2026-05-28 · 7 CVEs total

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CVE-2026-45041RustFS: Hard-coded RSA private key in license verifier permits arbitrary license forgery
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CVE-2026-46685RustFS: Reflective CORS with credentials on S3 listener; unauthenticated license metadata

IV. Related Vulnerabilities

Same product: rustfs
Same vendor: rustfs
Same weakness: CWE-863

V. Comments for CVE-2026-45042

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