PT-2026-40447 · Deskflow · Deskflow

Published 2026-05-12 · Updated 2026-05-13 · CVE-2026-44296

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Deskflow versions prior to 1.26.0.167

Description Remote, unauthenticated denial of service (DoS) affects servers running with TLS enabled. When a TCP peer connects to the listening port and the initial bytes are not a valid TLS ClientHello, the SecureSocket::secureAccept() function triggers a fatal-error branch and executes Arch::sleep(1)(). This causes a blocking 1-second sleep on the multiplexer worker thread, which is responsible for servicing all sockets, including those delivering mouse motion, keyboard events, and clipboard updates. Consequently, a single failed handshake stalls input delivery to all connected screens for approximately one second, and a continuous stream of malformed connections (one or more per second) renders the server unusable.

Recommendations Update to version 1.26.0.167.

Fix

DoS

Resource Exhaustion

Weakness Enumeration

CWE-405

CWE-400

Related Identifiers

CVE-2026-44296

Affected Products

Deskflow

References · 11

• https://nvd.nist.gov/vuln/detail/CVE-2026-44296 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2026-44296 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-44296 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-44296 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-44296 · Security Note
• https://ubuntu.com/security/CVE-2026-44296 · Vendor Advisory
• https://github.com/deskflow/deskflow/security/advisories/GHSA-3mxm-cgh2-6448 · Note
• https://github.com/deskflow/deskflow/commit/329783490bd16774ba903b84212467d20d76bfba · Note
• https://t.me/CVEtracker/53558 · Telegram Post
• https://twitter.com/CVEnew/status/2054324003561758859 · Twitter Post
• https://twitter.com/VulmonFeeds/status/2054440376962846789 · Twitter Post