UBUNTU-CVE-2026-63409

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Source
https://ubuntu.com/security/CVE-2026-63409
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-63409.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-63409
Upstream
Published
2026-08-17T21:16:00Z
Modified
2026-08-19T13:32:30.637914097Z
Severity
  • 8.2 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Deskflow is a keyboard and mouse sharing app. From 1.17.0 until continuous build 1.26.0.296, a malicious Deskflow server can send an odd-length DSOP vector to ServerProxy::setOptions() in src/lib/client/ServerProxy.cpp, causing the missing value after the final option key to be read beyond the vector during the PacketStreamFilter::filterEvent to ServerProxy::handleData() to ServerProxy::parseHandshakeMessage() call chain and crash the connected client. This issue is fixed in continuous build 1.26.0.296.

References

Affected packages

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-2026-63409.json"