---
id: CVE-2026-55193
title: FreeRDP is a free implementation of the Remote Desktop Protocol
summary: >-
  FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to
  3.27.0, FreeRDP clients using TS Gateway accept a server-controlled
  max_xmit_frag value in libfreerdp/core/gateway/rpc_bind.c without bounding it
  to the 4088-byte …
severity: high
cwe:
  - CWE-122
  - CWE-120
published: '2026-08-19'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T21:19:49.197'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-55193'
references:
  - url: >-
      https://github.com/FreeRDP/FreeRDP/commit/a863ef1cf1cdabf9019280e5658f806e73bb50e8
    label: security-advisories@github.com
  - url: 'https://github.com/FreeRDP/FreeRDP/pull/12873'
    label: security-advisories@github.com
  - url: 'https://github.com/FreeRDP/FreeRDP/releases/tag/3.27.0'
    label: security-advisories@github.com
  - url: 'https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-7rp4-66mc-j9vx'
    label: security-advisories@github.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-55193.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-55193'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2519818'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-55193'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-55193'
  - url: 'https://access.redhat.com/errata/RHSA-2026:66349'
  - url: 'https://access.redhat.com/errata/RHSA-2026:66347'
  - url: 'https://access.redhat.com/errata/RHSA-2026:69387'
tags:
  - nvd
  - csaf
  - vex
  - red-hat
epss: 0.00468
epssPercentile: 0.37843
ingestedAt: '2026-09-09T21:22:45.541Z'
vendor: Red Hat
product: Red Hat Enterprise Linux AppStream (v. 9)
affected:
  - enterprise_linux 6
  - enterprise_linux 7
  - enterprise_linux 8
  - enterprise_linux_appstream_v_10
  - enterprise_linux_appstream_v_9
  - enterprise_linux_codeready_linux_builder_v_10
  - enterprise_linux_codeready_linux_builder_v_9
patched:
  - enterprise_linux_appstream_v_10
  - enterprise_linux_appstream_v_9
  - enterprise_linux_codeready_linux_builder_v_10
  - enterprise_linux_codeready_linux_builder_v_9
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cvssSource: vendor
---

## Overview

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.27.0, FreeRDP clients using TS Gateway accept a server-controlled max_xmit_frag value in libfreerdp/core/gateway/rpc_bind.c without bounding it to the 4088-byte ReceiveFragment allocation. A malicious gateway can advertise 65535 and then send a response fragment of the same length, causing rpc_channel_read in libfreerdp/core/gateway/rpc.c to write up to 65535 bytes into the smaller ReceiveFragment buffer. This can crash the client and may permit code execution through attacker-controlled heap corruption. This issue is fixed in version 3.27.0.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **RHSA-2026:66349** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · released 2026-09-10 · [advisory](https://access.redhat.com/errata/RHSA-2026:66349)
- **RHSA-2026:66347** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) · released 2026-09-10 · [advisory](https://access.redhat.com/errata/RHSA-2026:66347)
- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7 · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-55193.json)
- **RHSA-2026:69387** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux CRB (v. 8) · released 2026-09-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:69387)