CVE-2026-44978 Details
Description
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.
A heap out-of-bounds read vulnerability has been identified in xrdp versions through 0.10.6. This issue resides within the FIPS-specific receive paths and is not present in the default configuration of xrdp. The vulnerability becomes exploitable when the security layer is set to 'security_layer=negotiate' or 'security_layer=rdp', and the crypto level is adjusted to 'crypt_level=fips' in the xrdp.ini file. In this non-default mode, the server improperly validates the FIPS padding length, causing a pointer underflow and a negative length calculation. An unauthenticated remote attacker can exploit this by sending a crafted FIPS-protected PDU, leading to a heap out-of-bounds read that causes a process crash, resulting in a denial-of-service condition. However, because xrdp typically forks a new process for each connection, this process crash is unlikely to disrupt the entire xrdp service.
Users can upgrade to xrdp version 0.10.6.1 to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jul 21, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/neutrinolabs/xrdp/releases/tag/v0.10.6.1 | [email protected] | Release Notes |
| https://github.com/neutrinolabs/xrdp/security/advisories/GHSA-9cg5-f7m7-ppvj | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-125 | Out-of-bounds Read | [email protected] |
| CWE-20 | Improper Input Validation | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| neutrinolabs xrdp | < 0.10.6.1 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 22, 2026 | Initial Analysis | [email protected] |
| Jul 21, 2026 | CVE Modified | CISA-ADP |
| Jul 20, 2026 | New CVE Received | [email protected] |