---
id: "CVE-2026-121411"
kind: "vulnerability"
aliases: ["CVE-2026-121411"]
title: "FreeRDP: malicious RDP server can crash X11 client via oversized surface output"
severity: "low"
cvss: 3.1
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["freerdp", "linux", "package", "rdp", "x11"]
not_affected_if: ["no-untrusted-rdp-servers", "version-3.32.2-or-later"]
published_at: "2026-11-03T15:17:30+00:00"
first_seen_at: "2026-11-03T15:21:58+00:00"
updated_at: "2026-11-03T15:24:50+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-121411", "first_seen_at": "2026-11-03T15:21:58+00:00"}]
---

# FreeRDP: malicious RDP server can crash X11 client via oversized surface output

FreeRDP before 3.32.2 does not bound server-supplied target dimensions and output origin in RDPGFX MAPSURFACETOSCALEDOUTPUT PDUs. A malicious RDP server can make the client abort, which denies service to the connected user.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the FreeRDP version installed on client machines, for example `xfreerdp --version`, and see whether it is below `3.32.2`.
- Look for FreeRDP builds bundled inside other applications, since those may carry an older copy.

## Fix

- FreeRDP: move to `3.32.2` or later.

## Timeline

- 2026-11-03T15:21:58+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-121411

## Documents

- [advisory] Vendor advisory: github.com https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-wffv-rjv2-h2x2
- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/freerdp-before-3.32.2-x11-client-abort-via-rdpgfx-scaled-output-geometry

## From the sources

FreeRDP before 3.32.2 fails to bound server-supplied target dimensions and output origin in RDPGFX MAPSURFACETOSCALEDOUTPUT PDUs, allowing malicious RDP servers to abort X11 clients. Attackers can map a surface to oversized scaled output, triggering checked UINT16 cast or freerdp_image_scale stride assertion failures that terminate the client.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_