Medium
xrdp — security advisory
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.
- Products
- xrdp
- Affected versions
- 0.10.1-3, 0.10.1-3.1, 0.10.1-3.1+deb13u1build0.25.10.1, 0.10.1-4, 0.10.1-4.1, 0.10.1-4.1ubuntu0.1, 0.10.6.1-2ubuntu1, 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, 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, 0.9.1-9, 0.9.12-1, 0.9.12-1ubuntu0.1, 0.9.12-1ubuntu0.1+esm1, 0.9.12-1ubuntu0.1+esm2, 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, 0.9.17-2ubuntu3.1, 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, 0.9.24-4ubuntu0.1~esm1, 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, 0.9.9-1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-55238
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:46 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2026-55238
xrdp
Fixed versions: Not specified
xrdp
Fixed versions: Not specified
xrdp
Fixed versions: Not specified
xrdp
Fixed versions: Not specified
xrdp
Fixed versions: Not specified
xrdp
Fixed versions: Not specified
xrdp
Fixed versions: Not specified
xrdp
Fixed versions: Not specified
xrdp
Fixed versions: Not specified
Complete source record
{
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"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-55238",
"method": "structured",
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"title": "UBUNTU-CVE-2026-55238",
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],
"modified": "2026-10-17T12:59:07.181519739Z",
"provider": "osv",
"upstream": [
"CVE-2026-55238"
],
"references": [
"https://ubuntu.com/security/CVE-2026-55238",
"https://www.cve.org/CVERecord?id=CVE-2026-55238",
"https://github.com/neutrinolabs/xrdp/security/advisories/GHSA-mg8j-x9rw-9xv3"
]
},
"related_cves": [
{
"value": "CVE-2026-55238",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 359320,
"published_at": "2026-07-20T17:18:00+00:00"
}