Heap-based buffer overflow in FreeRDP - #VU146584
Published: September 1, 2026
Vulnerability identifier: #VU146584
CSH Severity: Medium
CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/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 cause a denial of service.
The vulnerability exists due to a heap-based buffer overflow in nego_send_negotiation_request when processing an oversized LB_LOAD_BALANCE_INFO routing token during connection negotiation. A remote attacker can send a crafted Server Redirection PDU to cause a denial of service.
The issue is reachable before any security protocol handshake completes, and user interaction is required to connect to a malicious server or a machine-in-the-middle server.
Affected software
FreeRDP
Remediation
Install security update from vendor's website.
FreeRDP - update to 3.31.0