CVE-2026-67305 FreeRDP Windows Client before 3.29.0 Heap Buffer Overflow via Cliprdr
A malicious RDP server can trigger a heap buffer overflow in the FreeRDP Windows client, potentially enabling remote code execution during paste operations.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-67305?
CVE-2026-67305 is a critical memory corruption vulnerability in Freerdp Freerdp, published on 1 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
FreeRDP Windows client before 3.29.0 contains a heap buffer overflow vulnerability in the clipboard virtual channel when processing CLIPRDR_FILE_CONTENTS_RESPONSE 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.
Weakness: CWE-122
Which versions are affected by CVE-2026-67305?
It affects 1 product.
Products include Freerdp Freerdp.
How do I fix CVE-2026-67305?
No fix has been published for CVE-2026-67305 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-67305 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-67305 exists.
Other vulnerabilities in Freerdp Freerdp
Sources
Also known as GHSA-3w26-2cxg-pvh3, GHSA-cj9v-h4hq-29jr.