CVE-2026-45039

9.8 criticalEPSS 0.3%

Critical (9.8). EPSS 0.3% 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.

Severity

CVSS 3.1

9.8 critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.3% chance of exploitation in the next 30 days; higher than 19% of CVEs (scores of 2026-11-01)
CWEs: CWE-798, CWE-1392
Published: 2026-05-28
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

References

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

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