CVE-2026-44978

xrdp is an open source RDP server. Versions 0.10.6 and prior contain a heap out-of-bounds read vulnerability within the FIPS-specific receive paths. This vulnerability does not affect the default configuration of xrdp. The vulnerability is only exploitable when the security layer is set to security_layer=negotiate or security_layer=rdp, and the crypto level is changed to crypt_level=fips in xrdp.ini. In this specific non-default mode, the server fails to validate the FIPS padding length field, leading to a pointer underflow and a subsequent negative length calculation. An unauthenticated remote attacker can exploit this by sending a crafted FIPS-protected PDU, causing a heap out-of-bounds read that results in a process crash and denial of service (DoS). However, since xrdp forks a new process for each connection by default, an out-of-bounds read causing a process crash is unlikely to bring down the entire xrdp service. This issue has been fixed in version 0.10.6.1.

• CWE-20
• CWE-125

• https://github.com/neutrinolabs/xrdp/releases/tag/v0.10.6.1Release Notes
• https://github.com/neutrinolabs/xrdp/security/advisories/GHSA-9cg5-f7m7-ppvjVendor Advisory

Published

Jul 20, 2026

Last Modified

Jul 22, 2026

Status

Analyzed

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