Deskflow: TLS multiplexer DoS on failed `SSL_accept`_CVE-2026-44296

7.5 / 10

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Description

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.

Basic Information

ID CVE-2026-44296

Source GitHub_M

Published May 12, 2026 at 20:52

Affected Product

Vendor deskflow

Product deskflow

Version < 1.26.0.167

Affected Versions deskflow deskflow < 1.26.0.167

CWE Classification

CWE-400 CWE-405

References

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    "published": "2026-05-12T20:52:59.664Z",
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