Cleartext transmission of sensitive information in rclone - CVE-2026-116196
Published: November 4, 2026
Vulnerability identifier: #VU159319
CSH Severity: Medium
CVSS v4: 6 [CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-116196
CWE-ID: CWE-319
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker on the local network to disclose a live B2 account or application-key session token.
The vulnerability exists due to cleartext transmission of sensitive information in the rclone b2 backend's Object.getOrHead function when following an HTTPS-to-HTTP redirect to the same download host or a subdomain. A remote attacker on the local network can capture the Authorization header from the unencrypted redirect request to obtain the live B2 session token.
Affected software
rclone
How to mitigate CVE-2026-116196
Install security update from vendor's website.
rclone - update to 1.75.2