CVE-2026-109253 FreeRDP CVE debrief

Who should care

Defenders responsible for FreeRDP deployments should assess exposure and prioritize patching to prevent potential crashes. This includes operators, platform administrators, vulnerability management teams, and security teams who manage FreeRDP instances. They should review vendor advisories, conduct exposure reviews, and implement compensating controls where necessary.

Why it matters

Defenders should prioritize verifying FreeRDP versions and applying patches to prevent potential crashes. Limited information is available on potential exploits or impacts, requiring verification from official sources.

• Potential client process crashes
• Verification of FreeRDP versions and patches required
• Monitoring for potential crashes recommended

Technical summary

FreeRDP 3.9.0 before 3.32.0 contains an out-of-bounds read vulnerability in the RDPEAR NDR scalar readers. Malicious or compromised RDP servers can send crafted unaligned RDPEAR payloads to clients using Remote Credential Guard, potentially crashing the client process. The vulnerability is caused by insufficient checks on value length before consuming alignment padding in RDPEAR payloads. Defenders should prioritize verifying FreeRDP versions and applying patches to prevent potential crashes and verify FreeRDP versions.

Defensive priority

Defenders should prioritize verifying FreeRDP versions and applying patches to prevent potential crashes.

Recommended defensive actions

• Verify FreeRDP versions and apply patches
• Monitor for potential crashes
• Implement compensating controls for Remote Credential Guard
• Review vendor advisories for FreeRDP
• Conduct exposure reviews for affected deployments
• Track and inventory affected assets
• Review relevant monitoring and detection logs

Evidence notes

The CVE record and source item provide details on the vulnerability, but limited information is available on potential exploits or impacts. Defenders should verify FreeRDP versions and apply patches to prevent potential crashes. The vulnerability is in the RDPEAR NDR scalar readers, and malicious RDP servers can send crafted payloads to clients.

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.