Heap-based buffer overflow in FreeRDP - #VU134506
Published: June 15, 2026
Vulnerability identifier: #VU134506
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to heap-based buffer overflow in the TS Gateway RPC fragment receive logic when processing RESPONSE fragments from a TS Gateway after RPC bind negotiation. A remote attacker can send a crafted bind_ack and subsequent oversized RESPONSE fragments to execute arbitrary code.
The issue affects FreeRDP clients using TS Gateway / RD Gateway transport, and can also be triggered by an active machine-in-the-middle on gateway traffic. Direct RDP connections that do not use the gateway RPC layer are not affected.
Affected software
FreeRDP
Remediation
Install security update from vendor's website.
FreeRDP - update to 3.27.0