CVE-2026-114045 FreeRDP CVE debrief

Who should care

Defenders responsible for systems using FreeRDP, especially those exposed to untrusted RDP clients, should assess their exposure and prioritize patching or mitigation. This includes operators managing FreeRDP deployments, platform administrators, vulnerability management teams, and security teams responsible for monitoring and defending against potential exploitation.

Why it matters

Defenders should prioritize patching or mitigating CVE-2026-114045 due to the potential for code execution via a heap buffer overflow in FreeRDP before version 3.32.1. The vulnerability exists in the rdpsnd channel and can be exploited by a malicious RDP client. Systems exposed to untrusted RDP clients are at higher risk.

• Potential code execution via heap buffer overflow
• Unbounded heap write during server audio playback
• Bypass of validation in rdpsnd_server_select_format() function

Technical summary

The vulnerability exists in the rdpsnd channel of FreeRDP before version 3.32.1. An integer wraparound in the rdpsnd_server_select_format() function allows a malicious RDP client to cause an unbounded heap write during server audio playback. This could potentially enable code execution. The issue arises from the DVI_ADPCM block-alignment arithmetic, which bypasses validation. A malicious RDP client can send two SNDC_FORMATS PDUs with an nBlockAlign too small for nChannels, leading to an unbounded heap write during server audio playback.

Defensive priority

Defenders should prioritize patching or mitigating this vulnerability, especially for systems exposed to untrusted RDP clients.

Recommended defensive actions

• Patch FreeRDP to version 3.32.1 or later
• Implement network segmentation to limit exposure to untrusted RDP clients
• Monitor RDP traffic for suspicious activity
• Consider using compensating controls, such as Web Application Firewalls
• Review relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE Program record and NVD vulnerability detail provide official information about the vulnerability. Additional details are available from the source item and supplemental sources, including vendor and third-party advisories.

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.