CVE-2026-45039 (GCVE-0-2026-45039)

Vulnerability from cvelistv5 – Published: 2026-05-28 18:39 – Updated: 2026-05-30 02:11
VLAI
Title
RustFS: Internode RPC HMAC secret falls back to public default credential, enabling peer impersonation
Summary
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.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-798 - Use of Hard-coded Credentials
  • CWE-1392 - Use of Default Credentials
Assigner
References
Impacted products
Vendor Product Version
rustfs rustfs Affected: < 1.0.0-beta.2
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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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