CVE-2026-71312
Description
A flaw was found in rclone, a command-line program for syncing files. This vulnerability allows a remote attacker to execute arbitrary commands on the server when processing SFTP paths. By crafting a malicious filename that uses specific Unicode single-quote characters, an attacker can bypass security measures and inject PowerShell commands. This can lead to unauthorized command execution under the victim's SSH account during server-side hashing operations.
Statement
This is an Important vulnerability in rclone, a command-line file synchronization program, that allows for server-side command execution. An attacker can craft malicious SFTP filenames containing Unicode smart quotes to inject and execute arbitrary PowerShell commands on the system running rclone. This occurs when server-side hashing operations are invoked, potentially leading to compromise of the victim's SSH account.
Mitigation
avoid connecting rclone to SFTP servers
that use PowerShell as their SSH command shell, or disable server-side hashing
with --sftp-disable-hashcheck. Do not process files from untrusted sources on
SFTP remotes backed by PowerShell.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 8 | N/A | 8 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | Low | N/A | Low |
| User Interaction | Required | N/A | Required |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | High | N/A | High |
| Integrity Impact | High | N/A | High |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Understanding the Weakness (CWE)
Confidentiality,Integrity,Availability,Non-Repudiation
Technical Impact: Execute Unauthorized Code or Commands; DoS: Crash, Exit, or Restart; Read Files or Directories; Modify Files or Directories; Read Application Data; Modify Application Data; Hide Activities
Attackers could execute unauthorized operating system commands, which could then be used to disable the product, or read and modify data for which the attacker does not have permissions to access directly. Since the targeted application is directly executing the commands instead of the attacker, any malicious activities may appear to come from the application or the application's owner.
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