CVE-2026-109945
Received Received - Intake

Heap Use-After-Free in FreeRDP Smartcard Emulation

Publication date: 2026-10-13

Last updated on: 2026-10-13

Assigner: VulnCheck

Description
FreeRDP 3.0.0 before 3.32.0 contains a heap use-after-free vulnerability in smartcard emulation when SCARD_IOCTL_DISCONNECT and SCARD_IOCTL_TRANSMIT operate concurrently on one card handle. A malicious RDP server can overlap these IRPs through separate context workers to free and reuse the SCardHandle, causing client-process heap corruption and termination.

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Meta Information

Published
2026-10-13
Last Modified
2026-10-13
Generated
2026-10-13
AI Q&A
2026-10-13
EPSS Evaluated
N/A
NVD
CVE-2026-109945
EUVD
EUVD-2026-98710

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
FreeRDP FreeRDP 3.0.0

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-362 The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

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Executive Summary

CVE-2026-109945 is a heap use-after-free vulnerability in FreeRDP versions 3.0.0 to 3.31.1 affecting smartcard emulation. A malicious RDP server can trigger this by overlapping SCARD_IOCTL_DISCONNECT and SCARD_IOCTL_TRANSMIT operations on the same card handle through separate workers. This causes the client to free and reuse the SCardHandle while a pointer still references it, leading to heap corruption and process termination.

Detection Guidance

Detecting this vulnerability requires checking FreeRDP versions and smartcard emulation configurations. Use 'xfreerdp --version' to verify FreeRDP version. If using smartcard emulation, monitor for crashes or heap corruption during concurrent SCARD_IOCTL_DISCONNECT and SCARD_IOCTL_TRANSMIT operations.

Impact Analysis

The vulnerability can cause client crashes or termination due to heap corruption. It requires FreeRDP with smartcard emulation enabled and a malicious server with smartcard emulation configured. No reliable code execution or information disclosure has been demonstrated, but it disrupts client availability.

Mitigation Strategies

Upgrade FreeRDP to version 3.32.0 or later. Disable smartcard emulation if not required. Ensure no malicious RDP servers are connected to clients using vulnerable versions.

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