CVE-2026-45039: Rustfs

Critical severity, CVSS 9.8. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Rustfs Rustfs: before 1.0.0-beta.2 (fixed in 1.0.0-beta.2)

Published 2026-05-28. Last modified 2026-06-17.