CVE-2026-110836 FreeRDP CVE debrief

Who should care

Defenders responsible for RDP services, particularly those using FreeRDP, should be aware of this vulnerability and take steps to mitigate it. This includes patching or upgrading to a non-vulnerable version of FreeRDP, implementing network segmentation, and monitoring RDP traffic for suspicious activity.

Why it matters

CVE-2026-110836 is a high-severity vulnerability in FreeRDP that allows malicious gateways to cause a denial of service (DoS) by exhausting client CPU via crafted Content-Type headers. Defenders responsible for RDP services should be aware of this vulnerability and take steps to mitigate it.

• Denial of service (DoS) via CPU exhaustion
• Potential for lateral movement if RDP services are exposed to untrusted networks
• Need for patching or mitigation to prevent exploitation

Technical summary

The vulnerability is caused by an infinite loop in the http_response_recv() function of FreeRDP. This function is used to receive HTTP responses from a gateway. When a malicious gateway returns a nonzero Content-Length with a semicolon-containing unrecognized Content-Type, the function enters an infinite loop, causing the client thread to be pinned at full CPU indefinitely. FreeRDP versions from 3.0.0 before 3.32.0 are affected. Defenders should prioritize patching or mitigating this vulnerability, especially in environments where RDP is used to access critical systems or data.

Defensive priority

Defenders should prioritize patching or mitigating this vulnerability, especially in environments where RDP is used to access critical systems or data.

Recommended defensive actions

• Patch or upgrade FreeRDP to version 3.32.0 or later
• Implement network segmentation to limit access to RDP services
• Monitor RDP traffic for suspicious activity
• Consider implementing additional security controls, such as multi-factor authentication or intrusion detection systems
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check 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

Evidence notes

The vulnerability is described in the CVE Program record and the NVD vulnerability detail page. The CVE Program record provides official CVE metadata, while the NVD page provides a source-specific vulnerability assessment. Additional information is available from the vendor's advisory on GitHub and a third-party advisory from VulnCheck.

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.