Vulnerability 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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/deskflow/deskflow/commit/329783490bd16774ba903b84212467d20d76
- https://github.com/deskflow/deskflow/security/advisories/GHSA-3mxm-cgh2-6448
FAQ
What is CVE-2026-44296?
CVE-2026-44296 is a vulnerability with a CVSS score of 7.5 (HIGH). 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...
How severe is CVE-2026-44296?
CVE-2026-44296 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-44296?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.