OS Command Injection in rclone - #VU140657
Published: August 1, 2026
Vulnerability identifier: #VU140657
CSH Severity: Medium
CVSS v4: 8.5 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-78
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute arbitrary commands.
The vulnerability exists due to command injection in the backend/sftp PowerShell hash command handling when processing attacker-controlled SFTP filenames during server-side hashing. A remote user can create or rename a file with a specially crafted filename containing Unicode smart quotes to execute arbitrary commands.
Exploitation requires PowerShell as the SSH command shell, SSH exec enabled, and invocation of server-side hashing. User interaction is required to trigger a hash operation.
Affected software
rclone
Remediation
Install security update from vendor's website.
rclone - update to 1.75.0