What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 8.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-17 · updated 2026-09-09
• Weakness: CWE-125

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.

Affected products

• deskflow: from 1.17.0, < 1.26.0.296

References

• https://github.com/deskflow/deskflow/commit/8266fbbe6af93fa370018886c7f1f35d2cee8b3f
• https://github.com/deskflow/deskflow/security/advisories/GHSA-gmvh-3c73-m5gg
• https://github.com/deskflow/deskflow/security/advisories/GHSA-gmvh-3c73-m5gg

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