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HighVulnerabilityupdated 26 Oct 2026, 13:13 UTC

rclone file sync tool has several flaws that can be abused

rclone is a tool that copies and syncs files to cloud storage. Attackers can exploit several bugs in it to read or change your files, crash it, or bypass security checks.

Official source
SeverityHighVulnerability
Being exploited?UnclearNo reports either way yet
Fix available?UnclearNo fixed version published in the sources yet
How sure is this?Official sourceBacked by an official source

What happened

Multiple vulnerabilities exist in rclone, allowing attackers to bypass security measures, disclose or manipulate information, cause denial of service, and in one advisory, execute arbitrary code.

Why it is dangerous: Successful exploitation can expose or alter data synced by rclone and disrupt backup or transfer jobs; anyone running rclone with untrusted input or remote sources is at risk.

Are you affected?

You are affected if you run rclone on systems handling files from untrusted sources or remote storage, but the exact affected versions are not stated in the material.

What to do

  1. Check your installed rclone version with 'rclone version' and compare it against the vendor's latest release
  2. Update rclone to the newest available version as soon as possible
  3. Review the CERT-Bund advisory for the exact affected versions and any official mitigations

Timeline

  1. 26 Oct 2026, 12:59 UTC
    Publicly disclosed
  2. 26 Oct 2026, 12:59 UTC
    Reported by CERT-Bund (BSI) · CERT-Bund (BSI)
  3. 26 Oct 2026, 12:59 UTC
    Reported by CERT-Bund (BSI) · CERT-Bund (BSI)
  4. 26 Oct 2026, 13:05 UTC
    Picked up by Zero Radar

Sources 2 reports, oldest first

Official vendor, government CERT or advisory database

Technical details

ID
ZR-7f33a34e · ZR-a9ea13ab
Disclosed
26 Oct 2026, 12:59 UTC
On Zero Radar
26 Oct 2026, 13:05 UTC (6 min after disclosure)
Last change
26 Oct 2026, 13:13 UTC

The plain-language parts and the attack diagram were written by an AI model (anthropic/claude-haiku-5.5) from the sources above. Facts like versions, exploitation and dates come from the sources themselves. How Zero Radar works

rclone file sync tool has several flaws that can be abused · Zero Radar