Allocation of Resources Without Limits or Throttling in rclone - #VU140653
Published: August 1, 2026
Vulnerability identifier: #VU140653
CSH Severity: Medium
CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-770
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to allocation of resources without limits or throttling in the HTTP CONNECT helper when parsing proxy CONNECT responses. A remote attacker can send a crafted proxy response with excessively large headers to cause a denial of service.
This issue affects configured malicious or compromised proxies, and active on-path actors only for plaintext HTTP proxy connections.
Affected software
rclone
Remediation
Install security update from vendor's website.
rclone - update to 1.75.0