---
id: CVE-2026-71310
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 1.75.0, the shared HTTP CONNECT
  helper in lib/proxy/http.go parses proxy CONNECT responses with
  http.ReadResponse over…
severity: medium
cvss: 5.9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-400
  - CWE-770
vendor: rclone
product: github.com/rclone/rclone
affected:
  - github.com/rclone/rclone <= 1.74.0
patched:
  - github.com/rclone/rclone 1.75.0
published: '2026-08-05'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T20:50:00.950'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-71310'
references:
  - url: >-
      https://github.com/rclone/rclone/commit/21d8cd3b92cd81d987f485051d454ea675d91a2b
    label: security-advisories@github.com
  - url: 'https://github.com/rclone/rclone/releases/tag/v1.75.0'
    label: security-advisories@github.com
  - url: 'https://github.com/rclone/rclone/security/advisories/GHSA-xhf4-832v-7xcr'
    label: security-advisories@github.com
  - url: 'https://pkg.go.dev/vuln/GO-2026-6199'
    label: security-advisories@github.com
  - url: 'https://github.com/rclone/rclone/security/advisories/GHSA-xhf4-832v-7xcr'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://github.com/advisories/GHSA-xhf4-832v-7xcr'
tags:
  - nvd
  - ghsa
  - go
epss: 0.00611
epssPercentile: 0.47001
aliases:
  - GHSA-xhf4-832v-7xcr
ecosystem: go
ingestedAt: '2026-08-05T20:51:28.050Z'
---

## Overview

rclone is a command-line program to sync files and directories to and from different cloud storage providers. Prior to 1.75.0, the shared HTTP CONNECT helper in lib/proxy/http.go parses proxy CONNECT responses with http.ReadResponse over an unrestricted buffered reader, allowing a malicious or compromised configured proxy, or an active on-path actor controlling a plaintext HTTP proxy hop, to send oversized headers that grow memory until the rclone process fails. The affected helper is used by FTP and SFTP proxy connections, and SFTP reaches the parser before SSH server authentication, so target host key validation does not constrain a malicious proxy. This issue is fixed in 1.75.0.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-71310)

Affected packages:

- `github.com/rclone/rclone <= 1.74.0`

Patched in:

- `github.com/rclone/rclone 1.75.0`

Source: https://github.com/advisories/GHSA-xhf4-832v-7xcr