CVE-2026-53792: Rsyncproject Rsync

Medium severity, CVSS 6.5. EPSS: 0.3% chance of exploitation in the next 30 days.

rsync before 3.5.0 contains an out-of-bounds read vulnerability in the sender-side block matching logic that allows a malicious receiver to trigger memory access before the start of an allocated buffer by sending a crafted checksum block with a length of zero. Attackers can send a specially crafted checksum set containing a zero-length block to cause a negative offset calculation during delta computation, resulting in an out-of-bounds read of file data buffer memory on the sender side.

Affected products

• Rsyncproject Rsync: up to and including 3.4.4

Published 2026-08-13. Last modified 2026-09-08.