DEBIAN-CVE-2026-44296
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.
DEBIAN-CVE-2026-44296
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-44296
deskflow
Source reference: /affected/0/package/name
- Affected versions
- 1.22.0+dfsg-7
Source reference:
/affected/0/versions1.23.0+dfsg-1Source reference:
/affected/0/versions1.23.0+dfsg-2Source reference:
/affected/0/versions1.24.0+dfsg-1Source reference:
/affected/0/versions1.24.0+dfsg-2Source reference:
/affected/0/versions1.25.0+dfsg-1Source reference:
/affected/0/versions1.25.0+dfsg-2Source reference:
/affected/0/versions1.25.0+dfsg-3Source reference:
/affected/0/versions1.26.0+dfsg-1Source reference:
/affected/0/versions1.26.0+dfsg-2Source reference:
/affected/0/versions1.26.0+dfsg-3Source reference:
/affected/0/versions1.26.0+dfsg-4Source reference:
/affected/0/versions1.26.0+dfsg-5Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
deskflow
Source reference: /affected/1/package/name
- Affected versions
- 1.22.0+dfsg-7
Source reference:
/affected/1/versions1.23.0+dfsg-1Source reference:
/affected/1/versions1.23.0+dfsg-2Source reference:
/affected/1/versions1.24.0+dfsg-1Source reference:
/affected/1/versions1.24.0+dfsg-2Source reference:
/affected/1/versions1.25.0+dfsg-1Source reference:
/affected/1/versions1.25.0+dfsg-2Source reference:
/affected/1/versions1.25.0+dfsg-3Source reference:
/affected/1/versions1.26.0+dfsg-1Source reference:
/affected/1/versions1.26.0+dfsg-2Source reference:
/affected/1/versions - Fixed versions
- 1.26.0+dfsg-3
Source reference:
/affected/1/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "deskflow",
"purl": "pkg:deb/debian/deskflow?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"1.22.0+dfsg-7",
"1.23.0+dfsg-1",
"1.23.0+dfsg-2",
"1.24.0+dfsg-1",
"1.24.0+dfsg-2",
"1.25.0+dfsg-1",
"1.25.0+dfsg-2",
"1.25.0+dfsg-3",
"1.26.0+dfsg-1",
"1.26.0+dfsg-2",
"1.26.0+dfsg-3",
"1.26.0+dfsg-4",
"1.26.0+dfsg-5"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-44296.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.26.0+dfsg-3"
}
]
}
],
"package": {
"name": "deskflow",
"purl": "pkg:deb/debian/deskflow?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"1.22.0+dfsg-7",
"1.23.0+dfsg-1",
"1.23.0+dfsg-2",
"1.24.0+dfsg-1",
"1.24.0+dfsg-2",
"1.25.0+dfsg-1",
"1.25.0+dfsg-2",
"1.25.0+dfsg-3",
"1.26.0+dfsg-1",
"1.26.0+dfsg-2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-44296.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #57681 · Revision 1
- Added to Heist Feed
- Publisher date