CVE-2026-91956: FreeRDP before 3.31.0 Out-of-Bounds Read via URBDRC
FreeRDP before 3.31.0 contains an out-of-bounds read vulnerability in the URBDRC channel's funcgetepdesc function that indexes interface arrays by position instead of protocol field InterfaceNumber. A malicious RDP server can send a crafted SELECTCONFIGURATION message with permuted InterfaceNumber values to read past allocated heap memory and crash the client.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
FreeRDPto a version that resolves this vulnerability.Fixed in 3.31.0Patch FreeRDP before 3.31.0 Out-of-Bounds Read via URBDRC
Event History
Frequently Asked Questions
Who can trigger this issue?
An attacker operating a malicious RDP server can trigger it when a FreeRDP client connects and processes a crafted URBDRC SELECT_CONFIGURATION message. The attacker does not need credentials, but user interaction is required because the client must connect to the server.
What is the impact of successful exploitation?
The crafted message can cause FreeRDP to read beyond allocated heap memory and crash the client, resulting in a denial of service. The provided information does not establish confidentiality or integrity impact.
Which versions should be remediated?
FreeRDP versions before 3.31.0 are affected. Update to 3.31.0 or later.