---
id: CVE-2026-63409
title: Deskflow is a keyboard and mouse sharing app
summary: >-
  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 missi…
severity: high
cvss: 8.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H'
cwe:
  - CWE-125
published: '2026-08-17'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T21:11:46.833'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-63409'
references:
  - url: >-
      https://github.com/deskflow/deskflow/commit/8266fbbe6af93fa370018886c7f1f35d2cee8b3f
    label: security-advisories@github.com
  - url: >-
      https://github.com/deskflow/deskflow/security/advisories/GHSA-gmvh-3c73-m5gg
    label: security-advisories@github.com
  - url: >-
      https://github.com/deskflow/deskflow/security/advisories/GHSA-gmvh-3c73-m5gg
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00323
epssPercentile: 0.25645
ingestedAt: '2026-09-09T21:22:45.536Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.