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CVE-2026-88044

CVE-2026-88044 · rclone: RC per-server auth-proxy bypass

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. From 1.70.0 until 1.75.1, the serve/start RC interface accepts per-server proxyOpt.AuthProxy settings, and the FTP and S3 constructors in cmd/serve/ftp/ftp.go and cmd/serve/s3/server.go incorrectly check the process-global proxy.Opt.AuthProxy value instead. When the global value is empty, the request-local authentication proxy is ignored: FTP falls back to the fixed filesystem with username anonymous and any password, while S3 with AuthKey serves the fixed RC fs rather than the backend selected by the proxy. The dedicated command-line servers that configure the global option are not affected. This issue is fixed in version 1.75.1.

CVSS 9.1 · Critical · EPSS 0.5%

Published
Updated

Stack: system

Affected products and versions

  • rclone

    Versions
    • >= 1.70.0, < 1.75.1: 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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