CVE-2026-27607

CRITICAL EPSS 17.8%
Published Feb 25, 20264mo ago · Modified Jun 17, 20262w ago
9.1 CVSS 3.1
Critical
Find Similar
Published Feb 25, 2026 4mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
9.1
Exploitability
3.9
Impact
5.2
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
17.8% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 2

CWE-20 Improper Input Validation Validation
CWE-863 Incorrect Authorization Authorization

Affected Products 27

VendorProductVersionRange
rustfsrustfs1.0.0any
rustfsrustfs1.0.0any
rustfsrustfs1.0.0any
rustfsrustfs1.0.0any
rustfsrustfs1.0.0any
rustfsrustfs1.0.0any
rustfsrustfs1.0.0any
rustfsrustfs1.0.0any
rustfsrustfs1.0.0any
rustfsrustfs1.0.0any
rustfsrustfs1.0.0any
rustfsrustfs1.0.0any
rustfsrustfs1.0.0any
rustfsrustfs1.0.0any
rustfsrustfs1.0.0any
rustfsrustfs1.0.0any
rustfsrustfs1.0.0any
rustfsrustfs1.0.0any
rustfsrustfs1.0.0any
rustfsrustfs1.0.0any
rustfsrustfs1.0.0any
rustfsrustfs1.0.0any
rustfsrustfs1.0.0any
rustfsrustfs1.0.0any
rustfsrustfs1.0.0any
rustfsrustfs1.0.0any
rustfsrustfs1.0.0any

References 1

  • github.com https://github.com/rustfs/rustfs/security/advisories/GHSA-w5fh-f8xh-5x3p
    Vendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.