CVE-2026-109676 in FreeRDP
Summary
by MITRE • 10/13/2026
FreeRDP from 3.0.0-beta1 before 3.32.0 contains a use-after-free vulnerability in smartcard handling that allows attackers to access a freed smartcard handle object after an invalid connect operation. Attackers can trigger an invalid smartcard connect operation to cause reuse of the freed handle, leading to memory corruption or crashes.
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Analysis
by VulDB Data Team • 10/13/2026
The identified security flaw resides within the FreeRDP remote desktop protocol implementation, specifically affecting versions ranging from 3.0.0-beta1 up to but not including version 3.32.0. This vulnerability is classified as a use-after-free error in the module responsible for handling smartcard authentication mechanisms. In secure software design, memory management must ensure that once an object such as a handle or buffer is deallocated, any subsequent references to it are either prevented or safely redirected. However, in this specific implementation of FreeRDP, the lifecycle management of smartcard handles fails to properly invalidate pointers after they have been freed during certain error conditions. This architectural oversight creates a window where stale memory addresses remain accessible and potentially manipulable by external inputs.
The technical root cause involves an invalid connect operation that triggers the deallocation of a smartcard handle object without clearing the corresponding pointer or reference within the application state. When this occurs, the system retains knowledge of the freed memory location but does not prevent its reuse. An attacker who can interact with the FreeRDP client and influence the connection parameters may craft a specific sequence of operations that forces an invalid connect attempt. This action causes the smartcard subsystem to release the handle object while leaving dangling references intact in other parts of the application logic. Subsequent processing steps that rely on these stale references will access memory that has already been returned to the heap allocator, leading to undefined behavior.
The operational impact of this vulnerability is significant due to its potential for exploitation beyond simple denial-of-service scenarios. While a crash resulting from accessing freed memory can disrupt service availability and cause instability in remote desktop sessions, the primary concern lies in the possibility of arbitrary code execution or information disclosure. By carefully controlling the contents of the freed memory block through heap spraying techniques or by manipulating allocation patterns, an attacker may achieve control over program flow. This could allow for privilege escalation if the FreeRDP process runs with elevated permissions, or it could facilitate the exfiltration of sensitive data stored in adjacent memory regions, such as authentication tokens or session keys associated with the smartcard infrastructure.
From a classification perspective, this vulnerability aligns closely with CWE-416, which denotes Use After Free conditions where software continues to use pointers that point to freed memory. This category is particularly dangerous because it undermines the integrity of the application's memory space and can lead to severe security breaches if exploited correctly. Furthermore, in the context of adversary tactics, this flaw could be leveraged during initial access or execution phases within an attack chain, allowing threat actors to establish a foothold on compromised systems by exploiting remote client software rather than server-side vulnerabilities directly.
Mitigation strategies should prioritize immediate patching to version 3.32.0 or later, where the developers have addressed this memory management defect. Organizations relying on FreeRDP for secure remote access must ensure that their deployment pipelines enforce strict version controls and automated vulnerability scanning against known CVE databases. Additionally, implementing defense-in-depth measures such as heap hardening techniques, including Address Space Layout Randomization (ASLR) and Data Execution Prevention (DEP), can reduce the likelihood of successful exploitation even if a similar flaw were present in unpatched versions. Regular security audits focusing on memory safety patterns in C-based applications are also recommended to detect and prevent use-after-free conditions before they reach production environments.