Following discovery of a security issue, CVE-2026–43618, rsyncd 3.4.3 and later versions will reject chunk sizes larger than 32k. This breaks compatibility with acrosync-library which uses 64k chunks by default. I have opened RsyncProject/rsync#1002 but I wanted to raise the issue here as well for completeness.
The issue prevents using the PhotoBackup IOS app with newer versions of rsync. It looks like changing the DefaultChunkSize in rsync_client.cpp to 32k would probably resolve it. Thanks!
Following discovery of a security issue, CVE-2026–43618, rsyncd 3.4.3 and later versions will reject chunk sizes larger than 32k. This breaks compatibility with acrosync-library which uses 64k chunks by default. I have opened RsyncProject/rsync#1002 but I wanted to raise the issue here as well for completeness.
The issue prevents using the PhotoBackup IOS app with newer versions of rsync. It looks like changing the DefaultChunkSize in rsync_client.cpp to 32k would probably resolve it. Thanks!