UBUNTU-CVE-2026-44296

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Source

https://ubuntu.com/security/CVE-2026-44296

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44296.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-44296

Upstream

CVE-2026-44296

Published

2026-05-12T22:16:00Z

Modified

2026-05-20T21:47:59Z

Severity

7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

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.

References

Affected packages

Ubuntu:25.10 / deskflow

Package

Name: deskflow
Purl: pkg:deb/ubuntu/deskflow?arch=source&distro=questing

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.20.1+dfsg-1

1.21.2+dfsg-1

1.22.0+dfsg-2

1.22.0+dfsg-3

1.22.0+dfsg-4

1.22.0+dfsg-6

1.22.0+dfsg-7

1.23.0+dfsg-1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "deskflow",
            "binary_version": "1.23.0+dfsg-1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44296.json"

Ubuntu:26.04:LTS / deskflow

Package

Name: deskflow
Purl: pkg:deb/ubuntu/deskflow?arch=source&distro=resolute

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.23.0+dfsg-1

1.24.0+dfsg-2

1.25.0+dfsg-2

1.25.0+dfsg-3

1.26.0+dfsg-1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "deskflow",
            "binary_version": "1.26.0+dfsg-1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44296.json"