BIT-seaweedfs-2026-55874: SeaweedFS: Path traversal in the S3 gateway X-Amz-Copy-Source header allows cross-bucket object read
SeaweedFS versions prior to 4.34 contain a path traversal vulnerability in the S3 API gateway. This flaw allows an authenticated user with access scoped to one bucket to read objects from other buckets by exploiting the X-Amz-Copy-Source header in CopyObject and UploadPartCopy operations. The vulnerability is fixed in version 4.34.
AI Analysis
Technical Summary
SeaweedFS is a distributed storage system. In versions before 4.34, the S3 API gateway does not properly validate the X-Amz-Copy-Source header, allowing dot-dot path segments ("../") to be used. This enables an authenticated identity limited to a single bucket to perform server-side copy operations that read objects from other buckets, effectively bypassing bucket access controls. The issue is resolved in version 4.34 by rejecting such path traversal attempts in the header.
Potential Impact
An attacker with authenticated access scoped to one bucket can read objects from other buckets, violating data confidentiality and access controls within the SeaweedFS storage system. This could lead to unauthorized data disclosure across buckets.
Mitigation Recommendations
Upgrade SeaweedFS to version 4.34 or later, where this path traversal vulnerability in the S3 gateway is fixed. No other mitigations are indicated by the vendor advisory.
BIT-seaweedfs-2026-55874: SeaweedFS: Path traversal in the S3 gateway X-Amz-Copy-Source header allows cross-bucket object read
Description
SeaweedFS versions prior to 4.34 contain a path traversal vulnerability in the S3 API gateway. This flaw allows an authenticated user with access scoped to one bucket to read objects from other buckets by exploiting the X-Amz-Copy-Source header in CopyObject and UploadPartCopy operations. The vulnerability is fixed in version 4.34.
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
SeaweedFS is a distributed storage system. In versions before 4.34, the S3 API gateway does not properly validate the X-Amz-Copy-Source header, allowing dot-dot path segments ("../") to be used. This enables an authenticated identity limited to a single bucket to perform server-side copy operations that read objects from other buckets, effectively bypassing bucket access controls. The issue is resolved in version 4.34 by rejecting such path traversal attempts in the header.
Potential Impact
An attacker with authenticated access scoped to one bucket can read objects from other buckets, violating data confidentiality and access controls within the SeaweedFS storage system. This could lead to unauthorized data disclosure across buckets.
Mitigation Recommendations
Upgrade SeaweedFS to version 4.34 or later, where this path traversal vulnerability in the S3 gateway is fixed. No other mitigations are indicated by the vendor advisory.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- BIT-seaweedfs-2026-55874
- Osv Schema Version
- 1.6.2
- Aliases
- ["CVE-2026-55874"]
- Ecosystems
- ["Bitnami"]
- Database Specific Severity
- High
- Cvss Version
- null
Threat ID: 6a561c4868715ace4365a171
Added to database: 07/14/2026, 11:23:52 UTC
Last enriched: 07/14/2026, 11:32:40 UTC
Last updated: 07/14/2026, 11:32:40 UTC
Views: 2
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