CVE-2026-63409

Name	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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1145169

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
deskflow (PTS)	trixie	1.22.0+dfsg-7	vulnerable
	forky, sid	1.26.0+dfsg-5	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
deskflow	source	(unstable)	1.26.0+dfsg-4			1145169

Notes

[trixie] - deskflow <no-dsa> (Minor issue)
https://github.com/deskflow/deskflow/security/advisories/GHSA-gmvh-3c73-m5gg
Fixed by: https://github.com/deskflow/deskflow/commit/8266fbbe6af93fa370018886c7f1f35d2cee8b3f