CVE-2026-109256 FreeRDP 3.10.0 through 3.32.2 Heap Buffer Overflow in WinPR PNG Conversion
A malicious RDP peer can crash the FreeRDP client via a heap buffer overflow during PNG conversion of clipboard data.
- 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
- Available
What is CVE-2026-109256?
CVE-2026-109256 is a medium-severity memory corruption vulnerability in Freerdp Freerdp, published on 12 Oct 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 3.10.0 through 3.32.2 contains a heap buffer overflow in the WinPR png_write_data callback that writes past the buffer after a realloc failure. A malicious RDP clipboard peer can supply a large CF_DIB image that triggers out-of-bounds memcpy during PNG conversion, causing a client crash.
Weakness: CWE-122
Which versions are affected by CVE-2026-109256?
It affects 1 product.
Products include Freerdp Freerdp.
How do I fix CVE-2026-109256?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-109256 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-109256 exists.
Other vulnerabilities in Freerdp Freerdp
- CVE-2021-37594 Other in n/a
- CVE-2021-37595 Other in n/a
- CVE-2026-67305 FreeRDP Windows Client before 3.29.0 Heap Buffer Overflow via Cliprdr
- CVE-2026-66402 FreeRDP before 3.29.0 TLS Certificate Identity Validation Bypass
- CVE-2026-67289 FreeRDP before 3.29.0 HTTP Proxy Request Injection via Redirection
Sources
Also known as DEBIAN-CVE-2026-109256, GHSA-h8f2-6xfm-5cjf, GHSA-wf3x-658c-52m5, UBUNTU-CVE-2026-109256.