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CVE-2026-71310

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

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 5.9 · Medium · EPSS 0.6%

Published
Updated

Stack: system

Affected products and versions

  • rclone

    Versions
    • < 1.75.0: Affected

    No fix published

  • rclone Debian:12

    Versions
    • 1.60.1+dfsg-2
    • 1.60.1+dfsg-3
    • 1.60.1+dfsg-4
    • 1.65.0+dfsg-1
    • 1.65.0+dfsg-2
    • 1.69.3+dfsg-1
    • 1.69.3+dfsg-2
    • 1.69.3+dfsg-3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • rclone Debian:13

    Versions
    • 1.60.1+dfsg-4
    • 1.65.0+dfsg-1
    • 1.65.0+dfsg-2
    • 1.69.3+dfsg-1
    • 1.69.3+dfsg-2
    • 1.69.3+dfsg-3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • rclone Ubuntu:18.04:LTS

    Versions
    • 1.36-3
    • 1.36-3ubuntu0.1
    • 1.36-3ubuntu0.2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • rclone Ubuntu:Pro:20.04:LTS

    Versions
    • 1.47.0+ex1-6
    • 1.47.0+ex1-7
    • 1.49.5-2
    • 1.49.5-3
    • 1.50.2-2
    • 1.50.2-2ubuntu0.1
    • 1.50.2-2ubuntu0.2
    • 1.50.2-2ubuntu0.2+esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • rclone Ubuntu:Pro:22.04:LTS

    Versions
    • 1.53.3-1
    • 1.53.3-2
    • 1.53.3-4
    • 1.53.3-4ubuntu1
    • 1.53.3-4ubuntu1.22.04.1
    • 1.53.3-4ubuntu1.22.04.2
    • 1.53.3-4ubuntu1.22.04.3
    • 1.53.3-4ubuntu1.22.04.3+esm1
    • 1.53.3-4ubuntu1.22.04.4
    • 1.53.3-4ubuntu1.22.04.4+esm1
    • 1.53.3-4ubuntu1.22.04.5
    • 1.53.3-4ubuntu1.22.04.5+esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • rclone Ubuntu:Pro:24.04:LTS

    Versions
    • 1.60.1+dfsg-2build1
    • 1.60.1+dfsg-3
    • 1.60.1+dfsg-3ubuntu0.24.04.1
    • 1.60.1+dfsg-3ubuntu0.24.04.2
    • 1.60.1+dfsg-3ubuntu0.24.04.3
    • 1.60.1+dfsg-3ubuntu0.24.04.4
    • 1.60.1+dfsg-3ubuntu0.24.04.4+esm1
    • 1.60.1+dfsg-3ubuntu0.24.04.5
    • 1.60.1+dfsg-3ubuntu0.24.04.5+esm1
    • 1.60.1+dfsg-3ubuntu0.24.04.6
    • 1.60.1+dfsg-3ubuntu0.24.04.6+esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • rclone Ubuntu:26.10

    Versions
    • 1.60.1+dfsg-4ubuntu3
    • 1.69.3+dfsg-3
    • 1.69.3+dfsg-3ubuntu1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • rclone Ubuntu:Pro:26.04:LTS

    Versions
    • 1.60.1+dfsg-4ubuntu2
    • 1.60.1+dfsg-4ubuntu3
    • 1.60.1+dfsg-4ubuntu3.1
    • 1.60.1+dfsg-4ubuntu3.1+esm1
    • 1.60.1+dfsg-4ubuntu3.2
    • 1.60.1+dfsg-4ubuntu3.2+esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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