CVE-2026-44296— Deskflow: TLS multiplexer DoS on failed `SSL_accept`
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I. Basic Information for CVE-2026-44296
Vulnerability Information
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Vulnerability Title
Deskflow: TLS multiplexer DoS on failed `SSL_accept`
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: NVD (National Vulnerability Database)
Vulnerability Title
deskflow 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
deskflow是Deskflow开源的一款跨设备键盘鼠标共享工具。 Deskflow 1.26.0.167之前版本存在资源管理错误漏洞，该漏洞源于TLS握手失败时SecureSocket::secureAccept进入致命错误分支并阻塞多路复用器工作线程，可能导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-44296
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POCPremium
Qwen3.6-35B-A3B · 7461 chars
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III. Intelligence Information for CVE-2026-44296
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- https://github.com/deskflow/deskflow/security/advisories/GHSA-3mxm-cgh2-6448x_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2026-44296
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V. Comments for CVE-2026-44296
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