CVE-2026-63409
HighCVSS 8.2Exploitation Probability (EPSS)
Low risk25th percentile - higher than 25% of all known CVEs
Summary
Deskflow from version 1.17.0 until continuous build 1.26.0.296 has a vulnerability where a malicious Deskflow server can send an odd-length DSOP vector, causing an out-of-bounds read and crashing the connected client.
Risk Assessment
A remote attacker could cause a client crash, potentially leading to service disruption or further attacks.
Recommendation
Upgrade Deskflow to continuous build 1.26.0.296 or later, which contains the fix.
Other vulnerabilities in Deskflow
See all- CVE-2026-44296High
Deskflow, a keyboard and mouse sharing app, has a remote denial of service (DoS) vulnerability prior to version 1.26.0.167. Attackers can disrupt input delivery to all connected screens by sending malformed TCP connections.
- CVE-2026-65976Medium
Deskflow is a keyboard and mouse sharing app. From 1.17.0 until continuous build 1.26.0.300, a connected peer can send repeated DCLP DataChunk messages to ClipboardChunk::assemble(), causing the server or client to append data beyond the declared DataStart size and configured clipboard limit, exhausting receiver memory. This issue is fixed in continuous build 1.26.0.300.
- CVE-2026-65832High
Deskflow is a keyboard and mouse sharing app. Prior to continuous build 1.26.0.299, a remote unauthenticated Deskflow server can send kMsgDSetOptions (DSOP) values to ServerProxy::setOptions() in src/lib/client/ServerProxy.cpp so that the value following a modifier option poisons m_modifierTranslationTable, after which ServerProxy::translateKey() or ServerProxy::translateModifierMask() indexes the seven-row s_translationTable or s_masks arrays out of bounds, disclosing four bytes at an attacker-selected relative offset or crashing the connected client; an odd option count also causes an out-of-bounds OptionsList read. This issue is fixed in continuous build 1.26.0.299.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS