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CVE-2026-63409— Deskflow: Odd-length DSOP options vector causes out-of-bounds read in Deskflow client

CVSS 8.2 · High

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-63409

Vulnerability Information
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Vulnerability Title
Deskflow: Odd-length DSOP options vector causes out-of-bounds read in Deskflow client
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5

Affected Products

VendorProductAffected VersionsCPESubscribe
deskflowdeskflow >= 1.17.0, < 1.26.0.296 -

II. Public POCs for CVE-2026-63409

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 9207 chars
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III. Intelligence Information for CVE-2026-63409

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Patches & Fixes for CVE-2026-63409 (1)

Vendor Advisories for CVE-2026-63409 (1)

Same Patch Batch · deskflow · 2026-08-17 · 3 CVEs total

CVE-2026-658328.2 HIGHDeskflow - Unauthenticated server-controlled out-of-bounds read in ServerProxy::setOptions
CVE-2026-659766.5 MEDIUMDeskflow: Clipboard receiver can accumulate data beyond Deskflow's configured clipboard si

IV. Related Vulnerabilities

Same product: deskflow
Same vendor: deskflow
Same weakness: CWE-125

V. Comments for CVE-2026-63409

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