# CVE-2026-121951: FreeRDP 3.0.0 before 3.32.2 Denial of Service via Slow-Path Input Event


- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Fix available:** Yes
- **Published:** 4 Nov 2026
- **Updated:** 4 Nov 2026
- **Also known as:** DEBIAN-CVE-2026-121951, GHSA-4qq4-qwxq-49m8, GHSA-wcwc-8x6v-rgcq, UBUNTU-CVE-2026-121951

## What is CVE-2026-121951?

CVE-2026-121951 is a high-severity vulnerability in FreeRDP, published on 4 Nov 2026. 

### Official description

FreeRDP 3.0.0 before 3.32.2 server-side RDP peer input parsing skips the six-byte body of a slow-path input event with an unknown message type without checking it lies within the packet's declared length, causing a WinPR stream assertion failure. A remote RDP client with an active session can send a truncated unknown input event to abort assertion-enabled server processes, causing denial of service.

Weakness: CWE-617 (Reachable Assertion)

## Which versions are affected by CVE-2026-121951?

It affects 1 product.


Products: FreeRDP.

## How do I fix CVE-2026-121951?

Upgrade to a fixed version.

## Is CVE-2026-121951 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-121951 exists.

## Other vulnerabilities in FreeRDP

- [CVE-2024-32658](https://insights.sbomify.com/CVE-2024-32658/): FreeRDP ExtractRunLengthRegular* out of bound read (critical 9.8)
- [CVE-2024-32659](https://insights.sbomify.com/CVE-2024-32659/): freerdp_image_copy out of bound read (critical 9.8)
- [CVE-2024-32039](https://insights.sbomify.com/CVE-2024-32039/): FreeRDP Integer overflow & OutOfBound Write in clear_decompress_residual_data (critical 9.8)
- [CVE-2024-32041](https://insights.sbomify.com/CVE-2024-32041/): FreeRDP OutOfBound Read in zgfx_decompress_segment (critical 9.8)
- [CVE-2024-32458](https://insights.sbomify.com/CVE-2024-32458/): FreeRDP Out-Of-Bounds Read in planar_skip_plane_rle (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-121951 and fix it if it is affected.

What it is: CVE-2026-121951 is a high-severity vulnerability in FreeRDP, published on 4 Nov 2026. 
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-121951 exists.

Affected product: 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-2026-121951/ (Markdown: https://insights.sbomify.com/CVE-2026-121951/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-121951
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-121951
- OSV: https://osv.dev/vulnerability/CVE-2026-121951

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-121951/
Summaries are generated and may contain mistakes; the official description above is the record.