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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-45042
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 23:42 UTC · Revision 1
Source evidence
RustFS: UploadPartCopy Does Not Enforce Destination Bucket Policy on Copy Source
core-osv · Original sourcePublished 28 May 2026, 18:32 UTC
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.
osv:CVE-2026-45042
Complete source record
{
"id": "10c6aac135754ee991aaa91cccb03ddc06d56d2792487810ae6e0a45ce9571b4",
"url": "https://osv.dev/vulnerability/CVE-2026-45042",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "RustFS: UploadPartCopy Does Not Enforce Destination Bucket Policy on Copy Source",
"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.",
"evidence": "osv:CVE-2026-45042",
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"modified": "2026-10-28T02:30:40.353220621Z",
"provider": "osv",
"references": [
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"published_at": "2026-05-28T18:32:31.444+00:00"
}