# CVE-2026-32105: xrdp: RDP MAC signature (dataSignature) never verified on receive — integrity bypass in non-TLS mode

> An attacker with man-in-the-middle capabilities can modify encrypted RDP traffic undetected when TLS is not enforced, bypassing integrity checks.

- **Severity:** Critical 9.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:L/SC:H/SI:H/SA:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 17 Apr 2026
- **Updated:** 20 Apr 2026
- **Also known as:** DEBIAN-CVE-2026-32105, GHSA-j2jm-c596-c5q3, UBUNTU-CVE-2026-32105

## What is CVE-2026-32105?

CVE-2026-32105 is a critical vulnerability in neutrinolabs xrdp, published on 17 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

xrdp is an open source RDP server. In versions through 0.10.5, xrdp does not implement verification for the Message Authentication Code (MAC) signature of encrypted RDP packets when using the "Classic RDP Security" layer. While the sender correctly generates signatures, the receiving logic lacks the necessary implementation to validate the 8-byte integrity signature, causing it to be silently ignored. An unauthenticated attacker with man-in-the-middle (MITM) capabilities can exploit this missing check to modify encrypted traffic in transit without detection. It does not affect connections where the TLS security layer is enforced. This issue has been fixed in version 0.10.6. If users are unable to immediately upgrade, they should configure xrdp.ini to enforce TLS security (security_layer=tls) to ensure end-to-end integrity.

Weakness: CWE-354 (Improper Validation of Integrity Check Value)

## Which versions are affected by CVE-2026-32105?

It affects 1 product.


Products: Neutrinolabs Xrdp.

## How do I fix CVE-2026-32105?

Upgrade to a fixed version.

## Is CVE-2026-32105 being exploited?

There is no known exploitation of CVE-2026-32105 in the wild and no public exploit code.

## Other vulnerabilities in neutrinolabs xrdp

- [CVE-2026-41252](https://insights.sbomify.com/CVE-2026-41252/): xrdp: lib_palette_update Heap Buffer Overflow & RCE (critical 9.8)
- [CVE-2026-44178](https://insights.sbomify.com/CVE-2026-44178/): xrdp: Channel Data Forwarding Fixed-Size Buffer Overflow (high 8.8)
- [CVE-2026-32107](https://insights.sbomify.com/CVE-2026-32107/): xrdp: Fail-open privilege drop in sesexec — child processes may execute as root if setuid fails (high 8.8)
- [CVE-2026-33689](https://insights.sbomify.com/CVE-2026-33689/): xrdp: Pre-authentication out-of-bounds reads in channel parsers (high 8.7)
- [CVE-2026-35512](https://insights.sbomify.com/CVE-2026-35512/): xrdp: Heap buffer overflow in EGFX channel (high 8.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-32105 and fix it if it is affected.

What it is: CVE-2026-32105 is a critical vulnerability in neutrinolabs xrdp, published on 17 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-32105 in the wild and no public exploit code.

Affected product: neutrinolabs xrdp. 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-2026-32105/ (Markdown: https://insights.sbomify.com/CVE-2026-32105/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-32105
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-32105
- OSV: https://osv.dev/vulnerability/CVE-2026-32105

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-32105/
Summaries are generated and may contain mistakes; the official description above is the record.