CVE-2026-65976 Deskflow: Clipboard receiver can accumulate data beyond Deskflow's configured clipboard size limit
A malicious peer can exhaust receiver memory by sending repeated clipboard data chunks, causing a denial of service in Deskflow.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-65976?
CVE-2026-65976 is a medium-severity denial of service vulnerability in deskflow, published on 17 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Deskflow is a keyboard and mouse sharing app. From 1.17.0 until continuous build 1.26.0.300, a connected peer can send repeated DCLP DataChunk messages to ClipboardChunk::assemble() in src/lib/deskflow/ClipboardChunk.cpp, causing the server path in src/lib/server/ClientProxy1_6.cpp or client path in src/lib/client/ServerProxy.cpp to append data beyond the DataStart declared size and configured clipboard limit before DataEnd validation, exhausting receiver memory. This issue is fixed in continuous build 1.26.0.300.
Weakness: CWE-400
Which versions are affected by CVE-2026-65976?
How do I fix CVE-2026-65976?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-65976 being exploited?
There is no known exploitation of CVE-2026-65976 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-65976, GHSA-jf7g-qghg-p54x, UBUNTU-CVE-2026-65976.