Improper Validation of Array Index in rclone - #VU140643
Published: August 1, 2026
Vulnerability identifier: #VU140643
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-129
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to improper validation of array index in github.com/diskfs/go-diskfs filesystem/squashfs/metadatablock.go as used by rclone's archive backend when parsing a crafted SquashFS image with an out-of-range inode metadata offset. A remote user can send or access a specially crafted SquashFS image to cause a denial of service.
The issue can terminate an ordinary rclone command and, in archive-backed SFTP deployments, can terminate the entire SFTP server process.
Affected software
rclone
Remediation
Install security update from vendor's website.
rclone - update to 1.75.0