CVSS 3.1
9.1 criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:HCVE-2026-27607
Critical (9.1) in rustfs rustfs. EPSS 0.4% chance of exploitation in the next 30 days. Fixed in rustfs 1.0.0-alpha.83.
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.
Severity
- EPSS
- 0.4% chance of exploitation in the next 30 days; higher than 30% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-863, CWE-20
- Published
- Modified
- Record from
- the NVD, synced
Affected
- rustfs:rustfs
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-w5fh-f8xh-5x3p | crates.io | rustfs | >=1.0.0-alpha.56 <1.0.0-alpha.83 | 1.0.0-alpha.83 |