CVE-2026-55194

UNKNOWN 0.0

FreeRDPHeap-buffer-overflow write in TS Gateway RPC RESPONSE reassembly due to alloc_hint capacity mismatch

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-122
Vendor	freerdp
Product	freerdp
Published	Aug 19, 2026

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Affected Versions

FreeRDP / FreeRDP

< 3.27.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-9gxm-3mf5-f5cx github.com: https://github.com/FreeRDP/FreeRDP/pull/12873 github.com: https://github.com/FreeRDP/FreeRDP/commit/9f2da52c2341cc14a96ad12e69c5b83d0bcd8b5a github.com: https://github.com/FreeRDP/FreeRDP/releases/tag/3.27.0