Vulnerabilities CVE-2026-45039

CVE-2026-45039

Critical

Open

TLP:CLEAR

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

NVD CVE.org

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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.

Details

CVSS Score: 9.8
EPSS Score ⓘ: 0.27%

18.9th percentile
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Confidence: 90%
Published: May 28, 2026
Last Modified: May 28, 2026

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