Observable Response Discrepancy in xrdp - CVE-2026-42218

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Main Vulnerability Database Vulnerabilities #VU134543

Observable Response Discrepancy in xrdp - CVE-2026-42218

Published: June 15, 2026


Vulnerability identifier: #VU134543
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-42218
CWE-ID: CWE-204
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to disclose sensitive information via username enumeration.

The vulnerability exists due to observable response discrepancy in the login interface when processing authentication attempts. A remote attacker can measure response timing differences to disclose sensitive information via username enumeration.


Affected software

xrdp
Debian Linux
Fedora
xrdp (Debian package)
xrdp

How to mitigate CVE-2026-42218

Install security update from vendor's website.

xrdp - update to 0.10.6.1
xrdp (Debian package) - update to 0.10.1-3.1+deb13u2
xrdp - addressed in versions 0.10.6.1-1.el8, 0.10.6.1-1.el9, 0.10.6.1-1.fc43, 0.10.6.1-1.fc44

External References

Related Security Bulletins