CVE-2026-27951 FreeRDP has possible Integer overflow in Stream_EnsureCapacity
An integer overflow in FreeRDP can cause an endless blocking loop, leading to denial of service on 32-bit systems with high memory.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-27951?
CVE-2026-27951 is a medium-severity vulnerability in Freerdp Freerdp, published on 25 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.23.0, the function `Stream_EnsureCapacity` can create an endless blocking loop. This may affect all client and server implementations using `FreeRDP`. For practical exploitation this will only work on 32bit systems where the available physical memory is `>= SIZE_MAX`. Version 3.23.0 contains a patch. No known workarounds are available.
Weakness: CWE-190
Which versions are affected by CVE-2026-27951?
It affects 1 product.
Products include Freerdp Freerdp.
How do I fix CVE-2026-27951?
Upgrade to a fixed version.
Is CVE-2026-27951 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-27951 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-2026-27951, GHSA-qcfc-ghxr-h927, UBUNTU-CVE-2026-27951.