CVE-2026-63409: Deskflow: Odd-length DSOP options vector causes out-of-bounds read in Deskflow client
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 Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Deskflow clientto a version that resolves this vulnerability.Fixed in 1.26.0.296
Event History
Frequently Asked Questions
What is the severity of CVE-2026-63409?
The severity of CVE-2026-63409 is rated as high, with a base score of 8.2.
How do I fix CVE-2026-63409?
To fix CVE-2026-63409, update Deskflow to version 1.26.0.297 or later.
What does CVE-2026-63409 affect?
CVE-2026-63409 affects versions of Deskflow from 1.17.0 to 1.26.0.296.
What type of vulnerability is CVE-2026-63409?
CVE-2026-63409 is an out-of-bounds read vulnerability in the Deskflow client.
How can a malicious server exploit CVE-2026-63409?
A malicious Deskflow server can exploit CVE-2026-63409 by sending an odd-length DSOP options vector to the client.