CVE-2026-67305: FreeRDP Windows Client before 3.29.0 Heap Buffer Overflow via Cliprdr
FreeRDP Windows client before 3.29.0 contains a heap buffer overflow vulnerability in the clipboard virtual channel when processing CLIPRDRFILECONTENTSRESPONSE PDUs without validating the server-provided size against the destination buffer. A malicious RDP server can send a response with a data payload significantly larger than requested, causing arbitrary heap memory corruption that may enable remote code execution when a user performs a paste operation.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
FreeRDP Windows Clientto a version that resolves this vulnerability.Fixed in 3.29.0
Event History
Frequently Asked Questions
What is the severity of CVE-2026-67305?
CVE-2026-67305 has a critical severity rating of 9.4 on the CVSS scale.
How do I fix CVE-2026-67305?
To mitigate CVE-2026-67305, update to FreeRDP Windows Client version 3.29.0 or later.
What type of vulnerability is CVE-2026-67305?
CVE-2026-67305 is classified as a heap buffer overflow vulnerability.
Can a malicious RDP server exploit CVE-2026-67305?
Yes, a malicious RDP server can exploit CVE-2026-67305 by sending specially crafted clipboard responses.
What systems are affected by CVE-2026-67305?
CVE-2026-67305 affects all versions of FreeRDP Windows Client prior to version 3.29.0.