CVE-2026-27607CRITICAL 9.1EPSS p17.7%

CVE-2026-27607CVE-2026-27607

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.

Scoring

CVSS 3.19.1 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
EPSS0.27% probability of exploitation · percentile 17.7% · 2026-06-19T12:03:05Z
Published2026-02-25
Last modified2026-02-25

Underlying weaknesses· 2

CWE-20CWE-863

References

  1. https://github.com/rustfs/rustfs/security/advisories/GHSA-w5fh-f8xh-5x3p

2

TypeTargetConfidenceTier
WeaknessImproper Input Validationcwe-200%live
WeaknessIncorrect Authorizationcwe-8630%live

Related by meaning· 6

Nearest entities by semantic similarity across the cs-graph corpus.

CVE
CVE-2025-68705
CVE
CVE-2026-22043
CVE
CVE-2026-22042
CVE
CVE-2025-68926
CVE
CVE-2026-45040
CVE
CVE-2026-40937
Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.