CVE-2026-53792

Summary

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 Software

Weaknesses

• CWE-129: CWE-129 Improper Validation of Array Index
• CWE-787: CWE-787 Out-of-bounds Write

References

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

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