CVE-2026-27607

The record

RustFS is a distributed object storage system built in Rust. In versions 1.0.0-alpha.56 through 1.0.0-alpha.82, RustFS does not validate policy conditions in presigned POST uploads (PostObject), allowing attackers to bypass content-length-range, starts-with, and Content-Type constraints. This enables unauthorized file uploads exceeding size limits, uploads to arbitrary object keys, and content-type spoofing, potentially leading to storage exhaustion, unauthorized data access, and security bypasses. Version 1.0.0-alpha.83 fixes the issue.

Affected packages

Related vulnerabilities

• GHSA-w5fh-f8xh-5x3p RustFS: Missing Post Policy Validation leads to Arbitrary Object Write Same vulnerability
• GHSA-mm2q-qcmx-gw4w RustFS: ListServiceAccount authorizes against wrong admin action, enabling cross-user… Also affects rustfs
• CVE-2026-40937 RustFS is a distributed object storage system built in Rust. Also affects rustfs
• GHSA-pfcq-4gjr-6gjm RustFS: Missing admin authorization on notification target endpoints allows… Also affects rustfs
• GHSA-mx42-j6wv-px98 RustFS has an authorization bypass in multipart UploadPartCopy enables cross-bucket… Also affects rustfs
• CVE-2026-39360 RustFS is a distributed object storage system built in Rust. Also affects rustfs
• GHSA-v9fg-3cr2-277j Rust has Critical Stored XSS in Preview Modal, leading to Administrative Account Takeover Also affects rustfs
• CVE-2026-27822 RustFS is a distributed object storage system built in Rust. Also affects rustfs