CVE
CVE-2026-45039
RustFS: Internode RPC HMAC secret falls back to public default credential, enabling peer impersonation
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, getsharedsecret() in crates/ecstore/src/rpc/httpauth.rs, falls back to the public, source-tree-embedded DEFAULTSECRETKEY = "rustfsadmin" when neither the RUSTFSRPC_SECRET environment variable nor the global S3 secret key has been configured. This vulnerability is fixed in 1.0.0-beta.2.
Package Versions Affected
Package Version
patch Availability
No items found.
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CVSS Version
Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.8
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
-
Related Resources
No items found.
References
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45039.json, https://github.com/rustfs/rustfs/security/advisories/GHSA-r5qv-rc46-hv8q, https://nvd.nist.gov/vuln/detail/CVE-2026-45039