Description
Rclone from v1.68.0 before v1.75.2 contains an authorization bypass vulnerability in serve s3 --auth-proxy that allows authenticated tenants to manipulate other tenants' multipart uploads by referencing their upload IDs. Attackers who learn a victim's bucket, object, and upload ID can inject parts, complete, or abort in-flight uploads and view upload and object metadata across tenants.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| rclone | rclone | 1.68.0 – < 1.75.2 | 1.75.2 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | rclone | No fix yet | — |
| Ubuntu 18.04 LTS | rclone | No fix yet | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 26.04 LTS | rclone | No fix yet | — |
| Ubuntu Pro 24.04 LTS | rclone | No fix yet | — |
| Ubuntu Pro 22.04 LTS | rclone | No fix yet | — |
| Ubuntu Pro 20.04 LTS | rclone | No fix yet | — |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | rclone | 1.75.2-r0 | — |
Advisories 1
- WID-SEC-2026-4156 rclone: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 9, 2026
References
- GitHub Security Advisory (GHSA-35g6-9fjv-rmx5) vendor-advisory
- VulnCheck Advisory: Rclone v1.68.0 before v1.75.2 Authorization Bypass in serve s3 Multipart Uploads third-party-advisory