CVE-2026-44296: high-severity vulnerability in deskflow
Deskflow: TLS multiplexer DoS on failed `SSL_accept`
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 0.3%
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
deskflow · deskflowRelated CVEs — deskflow
In the same product, most dangerous first.
CVE-2026-65832HIGHDeskflow - Unauthenticated server-controlled out-of-bounds read in ServerProxy::setOptions / translateKey modifier-table indexingEPSS 0.6%CVE-2026-65976MEDIUMDeskflow: Clipboard receiver can accumulate data beyond Deskflow's configured clipboard size limitEPSS 0.5%CVE-2026-63409HIGHDeskflow: Odd-length DSOP options vector causes out-of-bounds read in Deskflow clientEPSS 0.5%CVE-2026-41476HIGHDeskflow: clipboard deserialization global-buffer-overflowEPSS 0.3%CVE-2026-41477HIGHDeskflow: Local privilege escalation via unauthenticated IPCEPSS 0.2%