What’s Vulnerable › Vulnerabilities
CVE-2026-27607: RustFS's Missing Post Policy Validation leads to Arbitrary Object Write
- Severity: critical (CVSS 9.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-02-25 · updated 2026-06-17
- Weakness: CWE-20
Description
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 products
- rustfs: 1.0.0-alpha56, 1.0.0-alpha57, 1.0.0-alpha58, 1.0.0-alpha59, 1.0.0-alpha60, 1.0.0-alpha61 (+21)
References
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