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CVE-2026-45039— RustFS: Internode RPC HMAC secret falls back to public default credential, enabling peer impersonation

Quick assessment

Affected
rustfs rustfs
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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，该漏洞源于内部RPC层在未配置共享密钥时回退到公开默认密钥，可能导致认证绕过。

CVSS 9.8 · Critical EPSS 0.48% · P39

Possible ATT&CK Techniques 1 AI

T1552.004 · Private Keys

Affected Version Matrix 1

VendorProduct Version RangeStatus
rustfs rustfs < 1.0.0-beta.2 affected
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I. Basic Information for CVE-2026-45039

Vulnerability Information
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Vulnerability Title
RustFS: Internode RPC HMAC secret falls back to public default credential, enabling peer impersonation
Source: CVE Program / CVE List V5
Vulnerability Description
RustFS is a distributed object storage system built in Rust. Prior to 1.0.0-beta.2, the internode RPC layer authenticates every request with an HMAC-SHA256 signature using a shared secret. The function that produces this secret, get_shared_secret() in crates/ecstore/src/rpc/http_auth.rs, falls back to the public, source-tree-embedded DEFAULT_SECRET_KEY = "rustfsadmin" when neither the RUSTFS_RPC_SECRET environment variable nor the global S3 secret key has been configured. This vulnerability is fixed in 1.0.0-beta.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
使用硬编码的凭证
Source: CVE Program / CVE List V5
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，该漏洞源于内部RPC层在未配置共享密钥时回退到公开默认密钥，可能导致认证绕过。
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

Vendor Product Affected Versions CPE Subscribe
rustfs rustfs < 1.0.0-beta.2 -

II. Public POCs for CVE-2026-45039

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 7964 chars
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III. Intelligence Information for CVE-2026-45039

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Vendor Advisories for CVE-2026-45039 (1)

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

CVE-2026-45044 RustFS: Authentication bypass in /profile/cpu and /profile/memory allows unauthenticated a
CVE-2026-45042 RustFS: UploadPartCopy Does Not Enforce Destination Bucket Policy on Copy Source
CVE-2026-45040 RustFS: Sensitive Information Leakage (SessionToken and SecretAccessKey) in RustFS Logs [D
CVE-2026-45041 RustFS: Hard-coded RSA private key in license verifier permits arbitrary license forgery
CVE-2026-47136 RustFS: Unauthenticated RustFS console license endpoint exposes license metadata
CVE-2026-46685 RustFS: Reflective CORS with credentials on S3 listener; unauthenticated license metadata

IV. Related Vulnerabilities

Same product: rustfs
Same vendor: rustfs
Same weakness: CWE-798

V. Comments for CVE-2026-45039

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