Categories
CVE-2026-27607

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

Summary

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

Original description

The description as published by the source.

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.

Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV

References

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