Skip to content
OpenAdvisories
High · 8.1 Public exploit CVE-2026-27607 EUVD-2026-8588GHSA-w5fh-f8xh-5x3p

RustFS's Missing Post Policy Validation leads to Arbitrary Object Write

Published Feb 25, 2026 · Updated Feb 25, 2026 · Assigned by GitHub_M

Vendor: rustfs Product: rustfs Package: rustfs Ecosystem: crates.io

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

VendorProductAffectedFixed
rustfs rustfs >= 1.0.0-alpha.56, < 1.0.0-alpha.83 —

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 1 repository

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Affected packages

EcosystemPackageAffectedFixedRecord
crates.io rustfs >= 1.0.0-alpha.56, < 1.0.0-alpha.83 1.0.0-alpha.83 GHSA-w5fh-f8xh-5x3p

References