CVE-2026-45039

CRITICAL

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

Title source: cna
STIX 2.1

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.

References (1)

Core 1
Core References

Scores

CVSS v3 9.8
EPSS 0.0027
EPSS Percentile 18.2%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact total

Details

CWE
CWE-1392 CWE-798
Status published
Products (1)
rustfs/rustfs < 1.0.0-beta.2
Published May 28, 2026
Tracked Since May 29, 2026