CVE-2026-45040Public exploitNetwork attack vector

Credential disclosure via unredacted debug logging

Published May 28, 2026 · Updated May 28, 2026

Information disclosure in RustFS before 1.0.0-beta.2 allows attackers to recover STS credentials from server debug logs. The AssumeRole handler formats Credentials without masking session_token, while s3s::service logs raw STS response bodies containing SecretAccessKey and JWT data. Exploitation requires RUST_LOG=debug and an authenticated AssumeRole request; log readers can recover the resulting plaintext credentials.

CVSS severity5.3
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Information disclosure in RustFS before 1.0.0-beta.2 allows attackers to recover STS credentials from server debug logs. The AssumeRole handler formats Credentials without masking session_token, while s3s::service logs raw STS response bodies containing SecretAccessKey and JWT data. Exploitation requires RUST_LOG=debug and an authenticated AssumeRole request; log readers can recover the resulting plaintext credentials.

The record

CVE
CVE-2026-45040
Published
May 28, 2026
Updated
May 28, 2026
Vendor
RustFS
Product
RustFS
Classifications
CWE-312, CWE-532, T1552.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 28, 2026CVE publishedPublication date reported by the CVE source.
  2. May 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.0.0-beta.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

RustFS · RustFSversion=< 1.0.0-beta.2

Published CVSS scores

5.3GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-312Cleartext Storage of Sensitive Information
CWE-532Insertion of Sensitive Information into Log File
T1552.001Credentials In Files

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo