CVE-2026-45039 CRITICAL

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

Vendor Rustfs
Product rustfs
Weakness CWE-798 · Hardcoded credentials
Published May 28, 2026
Last update May 30, 2026
View on NVD All CVEs

CVSS base score

9.8/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

May 28, 2026 CVE published
May 30, 2026 Record updated