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CVE-2026-55194 Details

Description

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.27.0, rpc_client_recv_fragment in libfreerdp/core/gateway/rpc_client.c ensures the response reassembly stream capacity using only the server-declared alloc_hint rather than the actual StubLength about to be written. A malicious TS Gateway can send a PTYPE_RESPONSE with a small alloc_hint and a much larger frag_length, causing Stream_Write to copy attacker-controlled stub data beyond the 4096-byte pdu->s buffer. This can crash the client and may permit code execution through heap corruption. This issue is fixed in version 3.27.0.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:9.8 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/FreeRDP/FreeRDP/commit/9f2da52c2341cc14a96ad12e69c5b83d0bcd8b5a	[email protected]	Patch
https://github.com/FreeRDP/FreeRDP/pull/12873	[email protected]	Issue TrackingPatch
https://github.com/FreeRDP/FreeRDP/releases/tag/3.27.0	[email protected]	Release Notes
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-9gxm-3mf5-f5cx	[email protected]	ExploitMitigationVendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-122	Heap-based Buffer Overflow	[email protected]

Affected Products

Product	Versions
freerdp freerdp	< 3.27.0
CPE cpe:2.3:a:freerdp:freerdp:::::::: Remediation No remediation found in references.

Change History

5 change records found show changes

Date	Action	Recorded By
Sep 24, 2026	Initial Analysis	[email protected]
Aug 27, 2026	CVE Modified	[email protected]
Aug 27, 2026	CVE Modified	CISA-ADP
Aug 21, 2026	CVE Modified	CISA-ADP
Aug 19, 2026	New CVE Received	[email protected]