Heap-based buffer overflow in FreeRDP - #VU146599
Published: September 1, 2026
Vulnerability identifier: #VU146599
CSH Severity: High
CVSS v4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/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 a heap-based buffer overflow in nego_send_negotiation_request when processing a server-controlled RoutingToken during RDP negotiation after redirection. A remote attacker can send a specially crafted server redirection PDU to execute arbitrary code.
Without chaining with a separate memory leak to defeat ASLR, the issue results in a client crash. User interaction is required because the victim must connect to a malicious RDP server.
Affected software
FreeRDP
Remediation
Install security update from vendor's website.
FreeRDP - update to 3.31.0