---
id: "CVE-2026-121960"
kind: "vulnerability"
aliases: ["CVE-2026-121960"]
title: "FreeRDP: crafted CredSSP request crashes the NLA shadow server"
severity: "high"
cvss: 8.7
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["freerdp", "package", "remote-desktop", "self-hosted"]
not_affected_if: ["nla-disabled", "no-shadow-server"]
published_at: "2026-11-04T16:17:48+00:00"
first_seen_at: "2026-11-04T16:28:14+00:00"
updated_at: "2026-11-04T16:28:37+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-121960", "first_seen_at": "2026-11-04T16:28:14+00:00"}]
---

# FreeRDP: crafted CredSSP request crashes the NLA shadow server

FreeRDP's NLA-enabled shadow server aborts when a CredSSP TSRequest omits the negoTokens field. An unauthenticated attacker can send a seven-byte request and stop the server process.

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

## How to check

- Check the installed FreeRDP version with `xfreerdp --version` or the package manager.
- Look for a running FreeRDP shadow server (`wlfreerdp-shadow` or `freerdp-shadow-cli`) with NLA enabled.

## Fix

- Move FreeRDP to `3.32.2` or later.

## Timeline

- 2026-11-04T16:28:14+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-121960

## Documents

- [advisory] Vendor advisory: github.com https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3pg4-5r42-wxvj
- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/freerdp-before-3.32.2-unauthenticated-denial-of-service-via-credssp-tsrequest

## From the sources

FreeRDP before 3.32.2 contains a denial of service vulnerability in the NLA-enabled shadow server when a CredSSP TSRequest omits negoTokens. Unauthenticated attackers can send a crafted seven-byte TSRequest containing only the version field to trigger a fatal WINPR_ASSERT and abort the server process.

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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_