CVE-2026-22855 FreeRDP has a heap-buffer-overflow in smartcard_unpack_set_attrib_call
A heap buffer overflow in FreeRDP's smartcard handling allows attackers to cause denial of service or read sensitive memory.
- 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-2026-22855?
CVE-2026-22855 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, a heap out-of-bounds read occurs in the smartcard SetAttrib path when cbAttrLen does not match the actual NDR buffer length. This vulnerability is fixed in 3.20.1.
Weakness: CWE-125
Which versions are affected by CVE-2026-22855?
It affects 1 product.
Products include Freerdp Freerdp.
How do I fix CVE-2026-22855?
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-2026-22855 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-22855 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 CLSA-2026-1771011053, DEBIAN-CVE-2026-22855, GHSA-rwp3-g84r-6mx9, MINI-jcj3-vxxp-wc65, UBUNTU-CVE-2026-22855.