Vulnerability · Published Aug 25, 2026 · Assigned by VulnCheck

CVE-2026-79780rclone before v1.75.0 Credential Exposure via S3 Redirect

Medium 5.3

In plain English

A medium-severity information exposure in rclone from rclone. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 4% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)0.1%top 96.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	rclone	no fix listed	DEBIAN-CVE-2026-79780
Debian:13	rclone	no fix listed	DEBIAN-CVE-2026-79780
Go	github.com/rclone/rclone	1.75.0	GHSA-8mxv-9xhp-86h4
Go	github.com/rclone/rclone	1.75.0	GO-2026-6188
Ubuntu:26.10	rclone	no fix listed	UBUNTU-CVE-2026-79780

Affected products (as reported)

Vendor	Product	Versions
rclone	rclone	0 – before 1.75.0

Weakness: CWE-200 · Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

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