CVE-2026-55193CWE-122

CVE-2026-55193

High · published August 19, 2026

CVSS v3.1
8.8
EPSS
0%
Percentile
37.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
8.7 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
EPSS
0.00447 · 37.8th percentile
Weakness
CWE-122 · Heap-based Buffer Overflow
Published
2026-08-19T22:16Z
Affected products (1)
ProductVersionsFixed in
freerdp/freerdp< 3.27.03.27.0
References (4)
https://github.com/FreeRDP/FreeRDP/commit/a863ef1cf1cdabf9019280e5658f806e73bb50e8 · [email protected]https://github.com/FreeRDP/FreeRDP/pull/12873 · [email protected]https://github.com/FreeRDP/FreeRDP/releases/tag/3.27.0 · [email protected]https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-7rp4-66mc-j9vx · [email protected]
EPSS history
Timeline
  • 19 AUG 17:46Z
    FreeRDP: Heap-buffer-overflow write in TS Gateway RPC fragment receive due to uncapped bind_ack max_xmit_frag
    cvelistv5