CVE-2026-22853 FreeRDP has a heap-buffer-overflow in ndr_read_uint8Array
A heap buffer overflow in FreeRDP's NDR array reader allows attackers to execute arbitrary code or cause denial of service via crafted RDP traffic.
- 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-2026-22853?
CVE-2026-22853 is a medium-severity memory corruption vulnerability in Freerdp Freerdp, published on 14 Jan 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 is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, RDPEAR’s NDR array reader does not perform bounds checking on the on‑wire element count and can write past the heap buffer allocated from hints, causing a heap buffer overflow in ndr_read_uint8Array. This vulnerability is fixed in 3.20.1.
Weakness: CWE-787
Which versions are affected by CVE-2026-22853?
It affects 1 product.
Products include Freerdp Freerdp.
How do I fix CVE-2026-22853?
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-2026-22853 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-22853 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-2026-22853, GHSA-47v9-p4gp-w5ch, MINI-pfcq-gjm4-cvfx, UBUNTU-CVE-2026-22853.