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CVE-2026-45039

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

Published: May 28, 2026Updated: May 29, 2026 Sources: CVE List NVDCWE-798
NVD MITRE
9.8CVSSCRITICAL
EPSS Score
0.3%
Top 81.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-798CWE-1392

Affected Products

rustfsrustfs
Library
OSS Libraries / generic-library
rustfsoss-projectOSS Librariesaka rustfs

Attack Graph

Products CVE Techniques Tactics

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Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

2 techniques
Credential Access
Initial Access
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References

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

Timeline

Published
May 28, 2026
Last Updated
May 29, 2026

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