CVE-2026-109945 FreeRDP CVE debrief

Who should care

Defenders responsible for FreeRDP deployments should assess exposure and prioritize patching to prevent potential heap corruption and client-process termination. Defenders should care about CVE-2026-109945 because it affects FreeRDP 3.0.0 before 3.32.0, and a malicious RDP server can exploit the vulnerability to cause heap corruption and client-process termination. Defenders should prioritize verifying FreeRDP versions and applying patches.

Why it matters

Defenders should care about CVE-2026-109945 because it affects FreeRDP 3.0.0 before 3.32.0, and a malicious RDP server can exploit the vulnerability to cause heap corruption and client-process termination. Defenders responsible for FreeRDP deployments should assess exposure and prioritize patching.

• Potential heap corruption and client-process termination
• Possible malicious RDP server activity
• Need for version verification and patching

Technical summary

The vulnerability exists in FreeRDP 3.0.0 before 3.32.0 and occurs when SCARD_IOCTL_DISCONNECT and SCARD_IOCTL_TRANSMIT operate concurrently on one card handle, allowing a malicious RDP server to overlap these IRPs and cause client-process heap corruption and termination. This heap use-after-free vulnerability in smartcard emulation can lead to potential heap corruption and client-process termination. A malicious RDP server can exploit this vulnerability by overlapping IRPs through separate context workers to free and reuse the SCardHandle.

Defensive priority

Defenders should prioritize verifying FreeRDP versions and applying patches to prevent potential heap corruption and client-process termination.

Recommended defensive actions

• Verify FreeRDP versions and apply patches
• Review and update affected systems
• Monitor for potential malicious RDP server activity
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and source item provide details on the vulnerability, including its description, affected versions, and references to vendor advisories. 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. Evidence is limited to CVE,

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.