Vulnerability Description
rclone is a command-line program to sync files and directories to and from different cloud storage providers. Prior to 1.75.0, the shared HTTP CONNECT helper in lib/proxy/http.go parses proxy CONNECT responses with http.ReadResponse over an unrestricted buffered reader, allowing a malicious or compromised configured proxy, or an active on-path actor controlling a plaintext HTTP proxy hop, to send oversized headers that grow memory until the rclone process fails. The affected helper is used by FTP and SFTP proxy connections, and SFTP reaches the parser before SSH server authentication, so target host key validation does not constrain a malicious proxy. This issue is fixed in 1.75.0.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/rclone/rclone/commit/21d8cd3b92cd81d987f485051d454ea675d91a2b
- https://github.com/rclone/rclone/releases/tag/v1.75.0
- https://github.com/rclone/rclone/security/advisories/GHSA-xhf4-832v-7xcr
- https://github.com/rclone/rclone/security/advisories/GHSA-xhf4-832v-7xcr
FAQ
What is CVE-2026-71310?
CVE-2026-71310 is a vulnerability with a CVSS score of 5.9 (MEDIUM). rclone is a command-line program to sync files and directories to and from different cloud storage providers. Prior to 1.75.0, the shared HTTP CONNECT helper in lib/proxy/http.go parses proxy CONNECT ...
How severe is CVE-2026-71310?
CVE-2026-71310 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-71310?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.