CVE-2026-63409: Deskflow

High severity, CVSS 8.2. EPSS: 0.5% chance of exploitation in the next 30 days.

Deskflow is a keyboard and mouse sharing app. From 1.17.0 until continuous build 1.26.0.296, a malicious Deskflow server can send an odd-length DSOP vector to ServerProxy::setOptions() in src/lib/client/ServerProxy.cpp, causing the missing value after the final option key to be read beyond the vector during the PacketStreamFilter::filterEvent to ServerProxy::handleData() to ServerProxy::parseHandshakeMessage() call chain and crash the connected client. This issue is fixed in continuous build 1.26.0.296.

Affected products

• Deskflow Deskflow: from 1.17.0, before 1.26.0.296 (fixed in 1.26.0.296)

Published 2026-08-17. Last modified 2026-09-09.