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CVE-2026-45039: RustFS: Shared secret key exposed in insecure scenarios

CVE-2026-45039

Summary

RustFS's internal communication system uses a secret key for authentication. However, in some cases, a default key is used instead of a properly configured one. This could potentially allow unauthorized access to the system. To address this, update to version 1.0.0-beta.2 or later.

Original title

Original 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.

nvd CVSS3.1 9.8

Vulnerability type

CWE-798 Use of Hard-coded Credentials

CWE-1392

https://github.com/rustfs/rustfs/security/advisories/GHSA-r5qv-rc46-hv8q

Published: 28 May 2026 · Updated: 30 May 2026 · First seen: 28 May 2026