CVE-2026-32624: xrdp: Heap buffer overflow in xrdp_sec_process_logon_info() via incorrect g_strncat length calculation

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-04-17 · updated 2026-10-26
Weakness: CWE-122

Description

xrdp is an open source RDP server. Versions through 0.10.5 contain a heap-based buffer overflow vulnerability in its logon processing. In environments where domain_user_separator is configured in xrdp.ini, an unauthenticated remote attacker can send a crafted, excessively long username and domain name to overflow the internal buffer. This can corrupt adjacent memory regions, potentially leading to a Denial of Service (DoS) or unexpected behavior. The domain_name_separator directive is commented out by default, systems are not affected by this vulnerability unless it is intentionally configured. This issue has been fixed in version 0.10.6.

Affected products

neutrinolabs xrdp: before 0.10.6 — fixed in 0.10.6

How to fix

Upgrade to a fixed version: neutrinolabs xrdp 0.10.6. Check the vendor advisory for mitigations.

References

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