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CVE-2026-71310— rclone: Unbounded HTTP CONNECT Response Headers Can Exhaust rclone Memory

Quick assessment

Affected
rclone rclone
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Rclone是Rclone团队开源的一个支持多协议的数据同步工具。 Rclone 1.75.0之前版本存在资源管理错误漏洞，该漏洞源于lib/proxy/http.go中的共享HTTP CONNECT helper使用http.ReadResponse解析代理CONNECT响应时未限制缓冲读取器，可能允许恶意代理发送超大标头导致内存增长直至rclone进程失败。

CVSS 5.9 · Medium EPSS 0.61% · P48

Possible ATT&CK Techniques 1 AI

T1071 · Application Layer Protocol

Affected Version Matrix 1

VendorProduct Version RangeStatus
rclone rclone < 1.75.0 affected
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I. Basic Information for CVE-2026-71310

Vulnerability Information
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Vulnerability Title
rclone: Unbounded HTTP CONNECT Response Headers Can Exhaust rclone Memory
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Rclone 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Rclone是Rclone团队开源的一个支持多协议的数据同步工具。 Rclone 1.75.0之前版本存在资源管理错误漏洞，该漏洞源于lib/proxy/http.go中的共享HTTP CONNECT helper使用http.ReadResponse解析代理CONNECT响应时未限制缓冲读取器，可能允许恶意代理发送超大标头导致内存增长直至rclone进程失败。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
rclone rclone < 1.75.0 -

II. Public POCs for CVE-2026-71310

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III. Intelligence Information for CVE-2026-71310

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Patches & Fixes for CVE-2026-71310 (1)

Vendor Advisories for CVE-2026-71310 (1)

Vendor Pages for CVE-2026-71310 (2)

Same Patch Batch · rclone · 2026-08-05 · 5 CVEs total

CVE-2026-71309 8.6 HIGH rclone: Incomplete path validation allows backend root escape in serve restic
CVE-2026-71312 8.0 HIGH rclone: PowerShell Smart-Quote Filename Injection Enables SFTP Server-Side Command Executi
CVE-2026-71313 6.9 MEDIUM rclone: Local Encoding Path Traversal
CVE-2026-71311 6.4 MEDIUM rclone: FTP Command Arguments Permit CRLF Injection When Custom Encoding Preserves Newline

IV. Related Vulnerabilities

Same product: rclone
Same vendor: rclone
Same weakness: CWE-400

V. Comments for CVE-2026-71310

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