---
id: CVE-2026-63652
title: FreeRDP is a free implementation of the Remote Desktop Protocol
summary: >-
  FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to
  3.28.0, rdpsnd_server_recv_formats in channels/rdpsnd/server/rdpsnd_main.c
  frees context->client_formats on a malformed Client Audio Formats PDU without
  clearing t…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-415
  - CWE-1341
vendor: freerdp
product: freerdp
affected:
  - freerdp < 3.28.0
patched:
  - freerdp 3.28.0
published: '2026-08-19'
updated: '2026-09-22'
sourceUpdated: '2026-09-22T19:41:48.837'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-63652'
references:
  - url: >-
      https://github.com/FreeRDP/FreeRDP/commit/caf653c0ba1c75ec8f298d1baa59770102a5d14c
    label: security-advisories@github.com
  - url: 'https://github.com/FreeRDP/FreeRDP/pull/12993'
    label: security-advisories@github.com
  - url: 'https://github.com/FreeRDP/FreeRDP/releases/tag/3.28.0'
    label: security-advisories@github.com
  - url: 'https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-9g22-w2gr-vcmp'
    label: security-advisories@github.com
  - url: 'https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-9g22-w2gr-vcmp'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63652.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-63652'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2519822'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-63652'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-63652'
  - url: 'https://access.redhat.com/errata/RHSA-2026:61378'
  - url: 'https://access.redhat.com/errata/RHSA-2026:68706'
tags:
  - nvd
  - csaf
  - vex
  - red-hat
epss: 0.00583
epssPercentile: 0.45558
ingestedAt: '2026-09-09T21:22:45.541Z'
---

## Overview

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.28.0, rdpsnd_server_recv_formats in channels/rdpsnd/server/rdpsnd_main.c frees context->client_formats on a malformed Client Audio Formats PDU without clearing the owning pointer or num_client_formats. An authenticated RDP client can trigger an error such as a cbSize larger than the remaining record, leave the dangling pointer in the server context, and cause rdpsnd_server_context_free to free the same allocation again at session teardown. This reliably terminates the server and can create allocator-dependent heap corruption. This issue is fixed in version 3.28.0.

## Affected

- `freerdp < 3.28.0`

## Remediation

Upgrade past the affected range:

- `freerdp 3.28.0`

## Vendor advisories

- **RHSA-2026:61378** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · released 2026-08-31 · [advisory](https://access.redhat.com/errata/RHSA-2026:61378)
- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 9 · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63652.json)
- **RHSA-2026:68706** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68706)