CVE-2026-63409

Received Received - Intake

Deskflow Server Memory Corruption via Malformed DSOP Vector

Publication date: 2026-08-17

Last updated on: 2026-08-17

Assigner: GitHub, Inc.

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.

CVSS Scores

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Meta Information

Published

2026-08-17

Last Modified

2026-08-17

Generated

2026-08-18

AI Q&A

2026-08-18

EPSS Evaluated

N/A

NVD

CVE-2026-63409

Affected Vendors & Products

Vendor	Product	Version / Range
deskflow	deskflow	From 1.17.0 (inc) to 1.26.0.296 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-125	The product reads data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

Executive Summary

Deskflow versions 1.17.0 to 1.26.0.296 contain a vulnerability where a malicious server can send a malformed DSOP vector with an odd length. This causes the client to read beyond the vector's bounds during handshake processing, leading to a crash.

Detection Guidance

This vulnerability is specific to Deskflow versions 1.17.0 through 1.26.0.296. To detect it, check the installed version of Deskflow on your system using commands like 'deskflow --version' or by inspecting the application properties. If the version is within the vulnerable range, the system is potentially affected.

Impact Analysis

This vulnerability allows a remote attacker to crash the Deskflow client application by sending a specially crafted packet. This results in denial of service for the user sharing keyboard and mouse input.

Compliance Impact

This vulnerability causes a client crash due to improper handling of server-sent data, which could lead to denial of service. While it does not directly expose sensitive data, a crash could disrupt operations handling personal or health information, potentially violating GDPR or HIPAA availability requirements.

Mitigation Strategies

Immediately update Deskflow to continuous build 1.26.0.296 or later, as this issue is fixed in that version. Avoid using untrusted Deskflow servers until the update is applied. Monitor official Deskflow channels for further updates or patches.

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