---
id: "CVE-2026-114045"
kind: "vulnerability"
aliases: ["CVE-2026-114045"]
title: "FreeRDP: malicious RDP client can overflow server heap via audio"
severity: "high"
cvss: 8.8
epss: 0.00484
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["freerdp", "linux", "package", "rdp-server", "self-hosted"]
not_affected_if: ["audio-channel-disabled", "client-only-use", "no-rdp-server"]
published_at: "2026-10-21T01:17:26+00:00"
first_seen_at: "2026-10-23T21:57:27+00:00"
updated_at: "2026-10-24T13:15:55+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-114045", "first_seen_at": "2026-10-23T21:57:27+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-114045", "first_seen_at": "2026-10-24T13:15:55+00:00"}]
---

# FreeRDP: malicious RDP client can overflow server heap via audio

FreeRDP before 3.32.1 has a heap buffer overflow in its server-side rdpsnd audio channel, caused by an integer wraparound in DVI_ADPCM block-alignment checks. A malicious RDP client can send crafted format PDUs to trigger an unbounded heap write, which could lead to code execution on the server.

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

## How to check

Check whether the FreeRDP server library version is below 3.32.1 (e.g. `pkg-config --modversion freerdp3` or the package manager query for freerdp).
Check whether your application runs a FreeRDP server with the rdpsnd audio channel enabled.

## Fix

Upgrade FreeRDP to 3.32.1 or later and rebuild or redeploy any application that links it.

## Timeline

- 2026-10-23T21:57:27+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-114045
- 2026-10-24T13:15:55+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-114045

## From the sources

FreeRDP before 3.32.1 contains a heap-based buffer overflow in the server-side rdpsnd channel because an integer wraparound in rdpsnd_server_select_format() DVI_ADPCM block-alignment arithmetic bypasses validation. A malicious RDP client can send two SNDC_FORMATS PDUs with an nBlockAlign too small for nChannels, causing an unbounded heap write during server audio playback, potentially enabling code execution.

---

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