CVE-2026-44296
HighSummary
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.
Risk Assessment
The organization may experience service interruptions, leading to disruptions for users relying on Deskflow. During an attack, all connections could be affected, resulting in significant performance degradation.
Recommendation
It is recommended to update Deskflow to version 1.26.0.167 or later to mitigate this vulnerability. Additionally, monitoring TCP connections for potential attacks is advisable.
Other vulnerabilities in Deskflow
See all- 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.
- CVE-2026-63409High
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.
Original NVD description (English source)
Deskflow is a keyboard and mouse sharing app. Prior to 1.26.0.167, a remote, unauthenticated denial of service (DoS) vulnerability affects Deskflow servers running with TLS enabled (the default). When any TCP peer connects to the listening port and its first bytes do not parse as a valid TLS ClientHello, SecureSocket::secureAccept enters its fatal-error branch and calls Arch::sleep(1) (a blocking 1-second sleep) on the multiplexer worker thread. That thread services every socket on the server, including established TLS clients delivering mouse motion, keyboard events, and clipboard updates. A single failed handshake therefore stalls input delivery to all connected screens for ~1 second, and a sustained drip of malformed connections (≥ 1/s) makes the server effectively unusable while the attack persists. This vulnerability is fixed in 1.26.0.167.