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TI-2026-32893 Aliases CVE-2026-45042

RustFS: UploadPartCopy Does Not Enforce Destination Bucket Policy on Copy Source

Priority MEDIUM 64CWE-863Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-863.

Summary

RustFS is a distributed object storage system built in Rust. Prior to 1.0.0-beta.2, improper authorization in the UploadPartCopy operation allows copying objects across buckets without enforcing destination bucket restrictions on allowed copy sources. The implementation validates GetObject permission on the source bucket and PutObject on the destination bucket independently, but does not enforce any policy constraints on whether the destination bucket permits the specified copy source. This enables unauthorized cross-bucket data movement. This vulnerability is fixed in 1.0.0-beta.2.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00207 10th percentileScored 2026-11-07
Fix Fixed rustfs (rustfs): 1.0.0-beta.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
rustfsrustfsbefore 1.0.0-beta.21.0.0-beta.2Patch availableCNA
  • rustfs Vendorrustfs Affected before 1.0.0-beta.2 Fixed in 1.0.0-beta.2 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:rustfs:rustfs:*:*:*:*:*:*:*:*——rustfs
  • cpe:2.3:a:rustfs:rustfs:*:*:*:*:*:*:*:* Versions — — ·rustfs

Remediation

  • Fix · CNA rustfs (rustfs) Fixed in 1.0.0-beta.2

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-45042

References

Other 1

  • TI-2025-42382 RustFS has a gRPC Hardcoded Token Authentication Bypass CVSS 3.1CRITICAL 9.8
  • TI-2026-32895 RustFS: Authentication bypass in /profile/cpu and /profile/memory allows unauthenticated access to profiling handlers CVSS 4.0HIGH 8.8
  • TI-2026-32892 RustFS: Hard-coded RSA private key in license verifier permits arbitrary license forgery CVSS 4.0HIGH 8.7
  • TI-2025-42176 RustFS Path Traversal Vulnerability CVSS 4.0HIGH 8.8
  • TI-2026-36822 RustFS Snowball Auto-Extract: Path Traversal allows cross-bucket object injection CVSS 3.1HIGH 8.6
  • TI-2026-32894 RustFS: ImportIam Allows Creation of Backdoor Service Accounts Under Any Parent Including Root CVSS 4.0CRITICAL 9.3
See all 32 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences