CVE-2026-79782

rclone before version 1.74.4 does not strip the X-Amz-Security-Token header when an S3 redirect changes the scheme from HTTPS to HTTP on the same host. An attacker positioned to intercept the resulting plaintext HTTP traffic can capture AWS STS session tokens transmitted in request headers, poten...

GHSA-GX4C-2HQX-CW2R rclone: S3 backend does not strip X-Amz-Security-Token on a same-host HTTPS->HTTP redirect

Vulnerability Details File: backend/s3/s3.go Lines: 1359-1380 functions s3CheckRedirect / s3RedirectCrossesHost Root Cause Commit e7b1eb774 released in v1.74.3 added a CheckRedirect policy for the S3 HTTP client whose purpose is to strip the X-Amz-Security-Token header the AWS STS session token...