Vulnerability · Published Aug 17, 2026 · Assigned by GitHub_M
CVE-2026-63409Deskflow: Odd-length DSOP options vector causes out-of-bounds read in Deskflow client
High 8.2
In plain English
A high-severity out-of-bounds read in deskflow from deskflow. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 39% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | deskflow | no fix listed | DEBIAN-CVE-2026-63409 |
| Debian:14 | deskflow | 1.26.0+dfsg-4 | DEBIAN-CVE-2026-63409 |
| Ubuntu:26.04:LTS | deskflow | no fix listed | UBUNTU-CVE-2026-63409 |
| Ubuntu:26.10 | deskflow | no fix listed | UBUNTU-CVE-2026-63409 |
Affected products (as reported)
Weakness: CWE-125 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H