---
id: CVE-2026-88018
title: >-
  rclone is a command-line program to sync files and directories to and from
  different cloud storage providers
summary: >-
  rclone is a command-line program to sync files and directories to and from
  different cloud storage providers. Prior to 1.75.1, rclone serve s3 configured
  with --auth-proxy but without --auth-key allows authPairMiddleware to register
  any …
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-287
  - CWE-306
vendor: rclone
product: rclone
affected:
  - rclone < 1.75.1
patched:
  - rclone 1.75.1
published: '2026-09-10'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T20:01:05.627'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-88018'
references:
  - url: >-
      https://github.com/rclone/rclone/commit/90595f34f27f569be6b27c57fe5ab65057d323bd
    label: security-advisories@github.com
  - url: 'https://github.com/rclone/rclone/releases/tag/v1.75.1'
    label: security-advisories@github.com
  - url: 'https://github.com/rclone/rclone/security/advisories/GHSA-xwwr-4h3p-r22c'
    label: security-advisories@github.com
  - url: 'https://github.com/rclone/rclone/security/advisories/GHSA-xwwr-4h3p-r22c'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-88018'
  - url: 'https://github.com/rclone/rclone'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-88018.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-88018'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-88018'
tags:
  - nvd
  - cve.org
  - exploit-available
  - osv
  - go
  - csaf
  - vex
  - red-hat
epss: 0.005
epssPercentile: 0.41717
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-09-10T16:14:24.917718Z'
ingestedAt: '2026-09-14T15:12:19.518Z'
aliases:
  - GHSA-xwwr-4h3p-r22c
  - BIT-rclone-2026-88018
  - GO-2026-6462
ecosystem: go
---

## Overview

rclone is a command-line program to sync files and directories to and from different cloud storage providers. Prior to 1.75.1, rclone serve s3 configured with --auth-proxy but without --auth-key allows authPairMiddleware to register any client-chosen accessKeyID with an empty ws.s3Secret. gofakes3 then verifies the request’s SigV4 signature against that same empty secret, while Server.auth passes the access key identifier as both the user and authentication value to the proxy without an independent per-identity secret. An unauthenticated network attacker can therefore choose an arbitrary access key, sign with an empty secret, and reach whatever backend the auth-proxy script resolves for that identity. This issue is fixed in version 1.75.1.

## Affected

- `rclone < 1.75.1`

## Remediation

Upgrade past the affected range:

- `rclone 1.75.1`

## Package advisory (CVE-2026-88018)

Affected packages:

- `github.com/rclone/rclone < 1.75.1`

Patched in:

- `github.com/rclone/rclone 1.75.1`

Source: https://osv.dev/vulnerability/GHSA-xwwr-4h3p-r22c

## Vendor advisories

- **Red Hat VEX** · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-88018.json)