ubuntu-cve-2026-55238
Vulnerability from osv_ubuntu
Published
2026-07-20 17:18
Modified
2026-07-29 07:59
Summary
Details
xrdp is an open source RDP server. Versions 0.10.6 and prior contain a vulnerability concerning the processing of RDP Confirm Active PDU, where during the capability negotiation phase, the parser did not perform sufficient length validation for specific capability sets. A remote, unauthenticated attacker could potentially exploit this flaw by sending a specially crafted RDP packet containing malformed capability data. Due to missing bounds checks, the xrdp process may perform out-of-bounds memory reads, which can result in the termination of the service (Denial of Service). 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.
Severity
5.3 (Medium)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "xrdp",
"binary_version": "0.6.0-1ubuntu0.1+esm3"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:14.04:LTS",
"name": "xrdp",
"purl": "pkg:deb/ubuntu/xrdp@0.6.0-1ubuntu0.1+esm3?arch=source\u0026distro=esm-infra-legacy/trusty"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.6.0-1",
"0.6.0-1ubuntu0.1",
"0.6.0-1ubuntu0.1+esm1",
"0.6.0-1ubuntu0.1+esm2",
"0.6.0-1ubuntu0.1+esm3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "xrdp",
"binary_version": "0.6.1-2ubuntu0.3+esm3"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "xrdp",
"purl": "pkg:deb/ubuntu/xrdp@0.6.1-2ubuntu0.3+esm3?arch=source\u0026distro=esm-apps/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.6.1-2",
"0.6.1-2ubuntu0.1",
"0.6.1-2ubuntu0.3",
"0.6.1-2ubuntu0.3+esm1",
"0.6.1-2ubuntu0.3+esm2",
"0.6.1-2ubuntu0.3+esm3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "xorgxrdp",
"binary_version": "0.9.5-2ubuntu0.1~esm3"
},
{
"binary_name": "xrdp",
"binary_version": "0.9.5-2ubuntu0.1~esm3"
},
{
"binary_name": "xrdp-pulseaudio-installer",
"binary_version": "0.9.5-2ubuntu0.1~esm3"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "xrdp",
"purl": "pkg:deb/ubuntu/xrdp@0.9.5-2ubuntu0.1~esm3?arch=source\u0026distro=esm-apps/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.9.1-9",
"0.9.4-1",
"0.9.4-2",
"0.9.4-3",
"0.9.4-4",
"0.9.4-5",
"0.9.5-1",
"0.9.5-1build1",
"0.9.5-2",
"0.9.5-2ubuntu0.1~esm1",
"0.9.5-2ubuntu0.1~esm2",
"0.9.5-2ubuntu0.1~esm3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "xrdp",
"binary_version": "0.9.12-1ubuntu0.1+esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:20.04:LTS",
"name": "xrdp",
"purl": "pkg:deb/ubuntu/xrdp@0.9.12-1ubuntu0.1+esm2?arch=source\u0026distro=esm-apps/focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.9.9-1",
"0.9.12-1",
"0.9.12-1ubuntu0.1",
"0.9.12-1ubuntu0.1+esm1",
"0.9.12-1ubuntu0.1+esm2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "xrdp",
"binary_version": "0.9.17-2ubuntu3+esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:22.04:LTS",
"name": "xrdp",
"purl": "pkg:deb/ubuntu/xrdp@0.9.17-2ubuntu3+esm2?arch=source\u0026distro=esm-apps/jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.9.15-1ubuntu1",
"0.9.17-1",
"0.9.17-2",
"0.9.17-2ubuntu1",
"0.9.17-2ubuntu2",
"0.9.17-2ubuntu2+esm1",
"0.9.17-2ubuntu3",
"0.9.17-2ubuntu3+esm1",
"0.9.17-2ubuntu3+esm2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "xrdp",
"binary_version": "0.9.24-4ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:24.04:LTS",
"name": "xrdp",
"purl": "pkg:deb/ubuntu/xrdp@0.9.24-4ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.9.21.1-1",
"0.9.24-2",
"0.9.24-3",
"0.9.24-3build1",
"0.9.24-3build2",
"0.9.24-4",
"0.9.24-4ubuntu0.1~esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "xrdp",
"binary_version": "0.10.1-3.1+deb13u1build0.25.10.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "xrdp",
"purl": "pkg:deb/ubuntu/xrdp@0.10.1-3.1+deb13u1build0.25.10.1?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.10.1-3",
"0.10.1-3.1",
"0.10.1-3.1+deb13u1build0.25.10.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "xrdp",
"binary_version": "0.10.1-4.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "xrdp",
"purl": "pkg:deb/ubuntu/xrdp@0.10.1-4.1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.10.1-3.1",
"0.10.1-4",
"0.10.1-4.1"
]
}
],
"aliases": [],
"details": "xrdp is an open source RDP server. Versions 0.10.6 and prior contain a vulnerability concerning the processing of RDP Confirm Active PDU, where during the capability negotiation phase, the parser did not perform sufficient length validation for specific capability sets. A remote, unauthenticated attacker could potentially exploit this flaw by sending a specially crafted RDP packet containing malformed capability data. Due to missing bounds checks, the xrdp process may perform out-of-bounds memory reads, which can result in the termination of the service (Denial of Service). 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.",
"id": "UBUNTU-CVE-2026-55238",
"modified": "2026-07-29T07:59:15Z",
"published": "2026-07-20T17:18:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-55238"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-55238"
},
{
"type": "REPORT",
"url": "https://github.com/neutrinolabs/xrdp/security/advisories/GHSA-mg8j-x9rw-9xv3"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-55238"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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