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

CVE-2026-45039

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

Description (CNA)

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 (CNA)

Vendor / product	Versions
rustfs / rustfs	affected < 1.0.0-beta.2

CWE

CWE-798, CWE-1392

References

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

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.