CVE-2026-53792

Description

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.

CVSS breakdown

Affected products

• RsyncProject / rsync0 – 3.4.4
• RsyncProject / rsync3.5.0 – 3.5.0

References

• VENDOR_ADVISORYhttps://github.com/RsyncProject/rsync/security/advisories/GHSA-cg57-rp9g-56hw
• PATCHhttps://github.com/RsyncProject/rsync/releases/tag/v3.5.0
• VENDOR_ADVISORYhttps://www.vulncheck.com/advisories/rsync-out-of-bounds-read-via-zero-length-checksum-block