CVE-2026-32623 xrdp: Heap buffer overflow in NeutrinoRDP channel reassembly
A heap buffer overflow in the optional NeutrinoRDP module allows remote code execution or denial of service via malicious RDP 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-2026-32623?
CVE-2026-32623 is a high-severity memory corruption vulnerability in neutrinolabs xrdp, published on 17 Apr 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
xrdp is an open source RDP server. Versions through 0.10.5 contain a heap-based buffer overflow vulnerability in the NeutrinoRDP module. When proxying RDP sessions from xrdp to another server, the module fails to properly validate the size of reassembled fragmented virtual channel data against its allocated memory buffer. A malicious downstream RDP server (or an attacker capable of performing a Man-in-the-Middle attack) could exploit this flaw to cause memory corruption, potentially leading to a Denial of Service (DoS) or Remote Code Execution (RCE). The NeutrinoRDP module is not built by default. This vulnerability only affects environments where the module has been explicitly compiled and enabled. Users can verify if the module is built by checking for --enable-neutrinordp in the output of the xrdp -v command. This issue has been fixed in version 0.10.6.
Weakness: CWE-122
Which versions are affected by CVE-2026-32623?
It affects 1 product.
Products include Neutrinolabs Xrdp.
How do I fix CVE-2026-32623?
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-2026-32623 being exploited?
There is no known exploitation of CVE-2026-32623 in the wild and no public exploit code.
Other vulnerabilities in neutrinolabs xrdp
- CVE-2026-41252 xrdp: lib_palette_update Heap Buffer Overflow & RCE
- CVE-2026-32105 xrdp: RDP MAC signature (dataSignature) never verified on receive — integrity bypass in non-TLS mode
- CVE-2026-44178 xrdp: Channel Data Forwarding Fixed-Size Buffer Overflow
- CVE-2026-32107 xrdp: Fail-open privilege drop in sesexec — child processes may execute as root if setuid fails
- CVE-2026-33689 xrdp: Pre-authentication out-of-bounds reads in channel parsers
Sources
Also known as DEBIAN-CVE-2026-32623, GHSA-phw3-qp59-x2v4, UBUNTU-CVE-2026-32623.