Is CVE-2026-63409 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-63409?

CVE-2026-63409 has a CVSS v3 severity of HIGH (8.2).

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CVE-2026-63409

Description

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.