CVE-2026-45042: RustFS: UploadPartCopy Does Not Enforce Destination Bucket Policy on Copy Source
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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
RustFSto a version that resolves this vulnerability.Fixed in 1.0.0-beta.2
Event History
Frequently Asked Questions
What is the severity of CVE-2026-45042?
CVE-2026-45042 has a risk rating of 56, indicating a moderate severity vulnerability.
How do I fix CVE-2026-45042?
To fix CVE-2026-45042, ensure that the destination bucket policy enforces restrictions on allowed copy sources in your RustFS configuration.
What systems are affected by CVE-2026-45042?
CVE-2026-45042 affects versions of RustFS prior to 1.0.0-beta.2.
What type of vulnerability is CVE-2026-45042?
CVE-2026-45042 is an authorization vulnerability that affects the UploadPartCopy feature in RustFS.
What impact does CVE-2026-45042 have on data security?
CVE-2026-45042 may allow unauthorized copying of objects between buckets, potentially leading to data exposure.