Deskflow up to 1.26.0.167 secureAccept resource consumption

Summaryinfo

A vulnerability was found in Deskflow up to 1.26.0.167. It has been classified as problematic. Affected is the function SecureSocket::secureAccept. Performing a manipulation results in resource consumption. This vulnerability is reported as CVE-2026-44296. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Deskflow up to 1.26.0.167. It has been classified as problematic. This affects the function SecureSocket::secureAccept. The manipulation with an unknown input leads to a resource consumption vulnerability. CWE is classifying the issue as CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. This is going to have an impact on availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-44296 since 05/05/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 314478 (Linux Distros Unpatched Vulnerability : CVE-2026-44296), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.26.0.167 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (314478). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

• Deskflow

Version

• 1.26.0.167

Website

• Product: https://github.com/deskflow/deskflow/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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