CVE-2026-88046 rclone: source object names can escape the configured root on upload
Attackers can escape configured root directories during uploads by exploiting path traversal in source object names, potentially accessing unauthorized storage locations.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-88046?
CVE-2026-88046 is a medium-severity path traversal vulnerability in rclone, published on 10 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-22
Which versions are affected by CVE-2026-88046?
4 open source packages ship an affected version, including github.com/rclone/rclone and rclone.
| Package | Affected | Fixed in |
|---|---|---|
github.com/rclone/rclone Go | All versions | 1.75.1 |
github.com/rclone/rclone Go | All versions | 1.75.1 |
github.com/rclone/rclone Go | All versions | 1.75.1 |
rclone Bitnami | All versions | 1.75.1 |
How do I fix CVE-2026-88046?
Upgrade github.com/rclone/rclone to 1.75.1 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-88046 being exploited?
There is no known exploitation of CVE-2026-88046 in the wild and no public exploit code.
Sources
Also known as BIT-rclone-2026-88046, DEBIAN-CVE-2026-88046, GHSA-38xv-hf3p-h7mq, GO-2026-6457, MINI-29rc-x28q-hx9p, MINI-74xq-mpr5-7pp9 and 7 more.