CVE-2026-88046
Received Received - Intake

Path Traversal in Rclone Cloud Sync Tool

Publication date: 2026-09-10

Last updated on: 2026-09-10

Assigner: GitHub, Inc.

Description
rclone is a command-line program to sync files and directories to and from different cloud storage providers. Prior to 1.75.1, rclone core does not reject parent-directory segments in source Object.Remote() values before fs/list, fs/walk, fs/sync, and fs/operations pass those values to destination backends. A flat-keyspace source object store populated with native non-rclone tooling can contain a raw .. key segment, and affected b2, swift, qingstor, oracleobjectstorage, internetarchive, smb, storj, sftp, webdav, ftp, filelu, shade, and sia destinations use path.Join(root, remote) before EncodeDot can neutralize the segment. A copy or upload can therefore escape the configured root into another bucket, share, or path reachable by the victim credential, with sftp and smb potentially reaching other filesystem or share locations under the same login authority. This issue is fixed in version 1.75.1.

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Meta Information

Published
2026-09-10
Last Modified
2026-09-10
Generated
2026-09-10
AI Q&A
2026-09-10
EPSS Evaluated
N/A
NVD
CVE-2026-88046
EUVD
EUVD-2026-75589

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
rclone rclone 1.75.1

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-22 The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

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Executive Summary

CVE-2026-88046 is a path traversal vulnerability in rclone where source object names containing sequences like '..' can escape the configured root directory during operations such as sync, copy, or upload. The issue occurs because rclone does not sanitize these sequences before passing them to destination backends. Affected backends include B2, Swift, SFTP, SMB, and others, allowing access to unintended locations or buckets.

Detection Guidance

To detect this vulnerability, check if your rclone version is below 1.75.1. Run: rclone version. If vulnerable, inspect logs for unexpected file transfers or directory listings outside configured roots. Review source object names for raw .. segments or leading slashes in backends like B2, Swift, or SFTP.

Impact Analysis

This vulnerability could allow an attacker to access files outside the intended directory or bucket, potentially overwriting or misdirecting data. For SFTP or SMB backends, it might reach other filesystem locations under the same login. The impact is limited to the victim's own account or accessible resources, posing integrity risks rather than confidentiality breaches.

Mitigation Strategies

Upgrade rclone to version 1.75.1 or later immediately. Review and restrict permissions for affected backends to minimize blast radius. Audit recent file transfers for unauthorized access to other buckets, shares, or paths. Monitor logs for path traversal attempts.

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