# CVE-2026-41476: Deskflow: clipboard deserialization global-buffer-overflow

> A remote attacker can trigger a global-buffer-overflow in Deskflow via malformed clipboard data, potentially leading to code execution or denial of service.

- **Severity:** High 7.4 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 24 Apr 2026
- **Updated:** 24 Apr 2026
- **Also known as:** DEBIAN-CVE-2026-41476, UBUNTU-CVE-2026-41476

## What is CVE-2026-41476?

CVE-2026-41476 is a high-severity memory corruption vulnerability in deskflow, published on 24 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Deskflow is a keyboard and mouse sharing app.  Prior to 1.26.0.138, a remote memory-safety vulnerability in Deskflow's clipboard deserialization allows a connected peer to trigger an out-of-bounds read by sending a malformed clipboard update. The issue is in the implementation of src/lib/deskflow/IClipboard.cpp. This is reachable because ClipboardChunk::assemble() in src/lib/deskflow/ClipboardChunk.cpp validates only the outer clipboard transfer size. It does not validate the internal structure of the serialized clipboard blob, so malformed inner lengths reach IClipboard::unmarshall() unchanged. This vulnerability is fixed in 1.26.0.138.

Weakness: CWE-120 (Buffer Copy without Checking Size of Input)

## Which versions are affected by CVE-2026-41476?

It affects 1 product.


Products: Deskflow Deskflow.

## How do I fix CVE-2026-41476?

Upgrade to a fixed version.

## Is CVE-2026-41476 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-41476 exists.

## Other vulnerabilities in deskflow

- [CVE-2026-41477](https://insights.sbomify.com/CVE-2026-41477/): Deskflow: Local privilege escalation via unauthenticated IPC (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-41476 and fix it if it is affected.

What it is: CVE-2026-41476 is a high-severity memory corruption vulnerability in deskflow, published on 24 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-41476 exists.

Affected product: deskflow. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-41476/ (Markdown: https://insights.sbomify.com/CVE-2026-41476/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-41476
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-41476
- OSV: https://osv.dev/vulnerability/CVE-2026-41476

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-41476/
Summaries are generated and may contain mistakes; the official description above is the record.