# CVE-2026-109946: FreeRDP 3.11.0 before 3.32.0 Reachable Assertion via AVC444 Odd Region Width

> A malicious RDP server can crash the FreeRDP client by sending an AVC444 region with an odd width, causing an assertion failure.

- **Severity:** High 7.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N`)
- **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:** Yes
- **Published:** 13 Oct 2026
- **Updated:** 18 Oct 2026
- **Also known as:** DEBIAN-CVE-2026-109946, GHSA-97pf-pwp3-2wrv, GHSA-vqwq-3725-m59m, UBUNTU-CVE-2026-109946

## What is CVE-2026-109946?

CVE-2026-109946 is a high-severity denial of service vulnerability in Freerdp Freerdp, published on 13 Oct 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

FreeRDP 3.11.0 before 3.32.0 does not validate that AVC444 and AVC444v2 region widths are even before YUV444 conversion, so an odd width reaches an assertion and aborts the client. A malicious or compromised RDP server can terminate a connected FreeRDP client after RDPGFX AVC444 negotiation by sending an in-bounds region rectangle with an odd width.

Weakness: CWE-617 (Reachable Assertion)

## Which versions are affected by CVE-2026-109946?

It affects 1 product.


Products: Freerdp Freerdp.

## How do I fix CVE-2026-109946?

Upgrade to a fixed version.

## Is CVE-2026-109946 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-109946 exists.

## Other vulnerabilities in Freerdp Freerdp

- [CVE-2021-37594](https://insights.sbomify.com/CVE-2021-37594/): Other in n/a (critical 9.8)
- [CVE-2021-37595](https://insights.sbomify.com/CVE-2021-37595/): Other in n/a (critical 9.8)
- [CVE-2026-67305](https://insights.sbomify.com/CVE-2026-67305/): FreeRDP Windows Client before 3.29.0 Heap Buffer Overflow via Cliprdr (critical 9.4)
- [CVE-2026-66402](https://insights.sbomify.com/CVE-2026-66402/): FreeRDP before 3.29.0 TLS Certificate Identity Validation Bypass (critical 9.3)
- [CVE-2026-67289](https://insights.sbomify.com/CVE-2026-67289/): FreeRDP before 3.29.0 HTTP Proxy Request Injection via Redirection (critical 9.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-109946 and fix it if it is affected.

What it is: CVE-2026-109946 is a high-severity denial of service vulnerability in Freerdp Freerdp, published on 13 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-109946 exists.

Affected product: Freerdp Freerdp. 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-2026-109946/ (Markdown: https://insights.sbomify.com/CVE-2026-109946/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-109946
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-109946
- OSV: https://osv.dev/vulnerability/CVE-2026-109946

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-109946/
Summaries are generated and may contain mistakes; the official description above is the record.