CVE-2026-42218 XRDP is vulnerable to a server timing attack, leading to user enumeration
A timing side-channel in the login interface allows remote attackers to enumerate valid usernames, leading to unauthorized information disclosure.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-42218?
CVE-2026-42218 is a medium-severity vulnerability in neutrinolabs xrdp, published on 20 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
xrdp is an open source RDP server. Versions 0.10.6 and prior contain a timing side-channel vulnerability in the login interface. Due to a discrepancy in response processing times, a remote attacker can infer the existence of a username on the system, leading to unauthorized information disclosure via username enumeration. This issue has been fixed in version 0.10.6.1.
Weakness: CWE-204
Which versions are affected by CVE-2026-42218?
It affects 1 product.
Products include Neutrinolabs Xrdp.
How do I fix CVE-2026-42218?
Upgrade to a fixed version.
Is CVE-2026-42218 being exploited?
There is no known exploitation of CVE-2026-42218 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-2026-42218, GHSA-3wr5-fwmh-qh34, UBUNTU-CVE-2026-42218.