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Advisory severityHigh8.8Red Hat Linux

High [CVE-2026-55193] Remote code execution or client crash via malicious TS Gateway

This high-severity Red Hat Linux advisory covers CVE-2026-55193 affecting Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support, Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-55193 Source published Source updated

VulniPulse record published Record updated

CVE-2026-55193
Affected products & platforms
Red Hat LinuxRed Hat Enterprise Linux
Open source advisory

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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 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. A flaw was found in FreeRDP.

FreeRDP clients using TS Gateway are vulnerable to a heap-buffer-overflow. Red Hat severity: Important — CVSS 8.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H).

Weakness: CWE-120.

Affected products named by the advisory: Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On; Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support; and 9 more.

Affected versions
  • < 3.27.0

Official advisory · high-confidence parse· fetched 8 days ago·verify at source

Fixed versions
  • 3.27.0
  • freerdp-2:3.10.3-12.el10_2.11
  • freerdp-2:3.10.3-3.el10_0.18
  • freerdp-2:2.11.7-13.el8_10
  • freerdp-2:2.2.0-14.el8_4.4
  • freerdp-2:2.2.0-7.el8_6.13
  • freerdp-2:2.2.0-12.el8_8.12
  • freerdp-2:2.11.7-7.el9_8.7
  • freerdp-2:2.4.1-6.el9_2.13
  • freerdp-2:2.11.2-1.el9_4.12
  • freerdp-2:2.11.7-1.el9_6.14
  • RHSA-2026:66349
  • RHSA-2026:74471
  • RHSA-2026:69387
  • RHSA-2026:73026
  • RHSA-2026:73027
  • RHSA-2026:73068
  • RHSA-2026:66347
  • RHSA-2026:74470
  • RHSA-2026:72481
  • RHSA-2026:72479

Official advisory · high-confidence parse· fetched 8 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

Official advisory · high-confidence parse· fetched 8 days ago·verify at source

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