Description
rclone before v1.75.0 fails to sanitize IBM IAM bearer tokens and SSE-C encryption keys during S3 redirect callbacks, allowing credentials to be preserved across scheme or host changes. Attackers observing network traffic from a trusted endpoint can capture reusable IBM IAM tokens on same-host HTTPS-to-HTTP downgrades or SSE-C keys on cross-origin redirects to access protected S3 objects.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| rclone | rclone | < 1.75.0 | 1.75.0 |
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.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 13 | rclone | No fix yet | — |
| Debian 12 | rclone | No fix yet | — |
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 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | rclone | 1.75.1-1.amzn2023 | ALAS2023-2026-3129 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | github.com/rclone/rclone | < 1.75.0 | 1.75.0 | GHSA-8mxv-9xhp-86h4 |
Advisories 2
- WID-SEC-2026-2623 rclone: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 25, 2026
- ALAS2023-2026-3129 Important: rclone security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Sep 28, 2026
References
- GitHub Security Advisory (GHSA-8mxv-9xhp-86h4) vendor-advisory
- VulnCheck Advisory: rclone before v1.75.0 Credential Exposure via S3 Redirect third-party-advisory