rclone before 1.74.4 fails to strip the X-Amz-Security-Token header when an S3 redirect changes scheme from HTTPS to HTTP on the same host. (CVE-2026-79782)
Description
rclone versions before 1.74.4 have a vulnerability where the X-Amz-Security-Token header is not removed when an S3 redirect changes the scheme from HTTPS to HTTP on the same host. This can allow attackers who intercept the downgraded HTTP traffic to capture AWS STS session tokens. The vulnerability has a medium severity with a CVSS score of 3.1.
CVSS v3.1
Score 3.1low
Affected software
pkg:deb/ubuntu/rclone?arch=source&distro=bionicpkg:deb/ubuntu/rclone?arch=source&distro=esm-apps/focalpkg:deb/ubuntu/rclone?arch=source&distro=esm-apps/jammypkg:deb/ubuntu/rclone?arch=source&distro=esm-apps/noblepkg:deb/ubuntu/rclone?arch=source&distro=stonkingpkg:deb/ubuntu/rclone?arch=source&distro=esm-apps/resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
rclone before version 1.74.4 fails to strip the X-Amz-Security-Token header when an S3 redirect changes the scheme from HTTPS to HTTP on the same host. This improper handling of security tokens in redirects can lead to exposure of AWS STS session tokens over plaintext HTTP connections if an attacker can intercept the traffic.
Potential Impact
Attackers able to intercept HTTP traffic after a redirect from HTTPS to HTTP on the same host can capture AWS STS session tokens included in the X-Amz-Security-Token header. This exposure can lead to unauthorized use of AWS temporary credentials, potentially compromising AWS resources associated with those tokens. The impact is limited to confidentiality (partial disclosure of session tokens) and does not affect integrity or availability.
Mitigation Recommendations
A fix is available in rclone version 1.74.4 and later. Users should upgrade to version 1.74.4 or newer to ensure the X-Amz-Security-Token header is properly stripped during redirects that downgrade from HTTPS to HTTP. Until upgraded, avoid scenarios where redirects downgrade the scheme from HTTPS to HTTP to prevent token exposure.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-79782
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:Pro:22.04:LTS","Ubuntu:Pro:24.04:LTS","Ubuntu:26.10","Ubuntu:Pro:26.04:LTS"]
- Cvss Version
- 3.1
Threat ID: 6ad3f56b2cdf04f6566620f5
Added to database: 10/17/2026, 22:23:39 UTC
Last enriched: 10/17/2026, 23:36:34 UTC
Last updated: 10/17/2026, 23:36:34 UTC
Views: 3
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