Out-of-bounds Read in Deskflow
CVE-2026-63409
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.
Vulnerability class: Buffer Overflow
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H.
Affected products
- Deskflow — versions >= 1.17.0, < 1.26.0.296
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_CONFIRM)
Frequently asked questions
- What is CVE-2026-63409?
- CVE-2026-63409 is a high-severity vulnerability in Deskflow, classified under Out-of-bounds Read. CVSS score: 8.2/10. Published 2026-08-17.
- How severe is CVE-2026-63409?
- High severity. CVSS v3 base score is 8.2 out of 10.