High

xrdp: Pre-authentication out-of-bounds reads in channel parsers

Type: advisorySources: OSV

xrdp is an open source RDP server. Versions through 0.10.5 have an out-of-bounds read vulnerability in the pre-authentication RDP message parsing logic. A remote, unauthenticated attacker can trigger this flaw by sending a specially crafted sequence of packets during the initial connection phase. This vulnerability results from insufficient validation of input buffer lengths before processing dynamic channel communication. Successful exploitation can lead to a denial-of-service (DoS) condition via a process crash or potential disclosure of sensitive information from the service's memory space. This issue has been fixed in version 0.10.6.

Products: Not specified
Affected versions: Not specified
Fixed versions: Not specified
CVEs: CVE-2026-33689
Confirmed fixed CVEs: Not specified
Updated in this feed: 3 Nov 2026, 13:13 UTC · Revision 1

Source evidence

xrdp: Pre-authentication out-of-bounds reads in channel parsers

core-osv · Original source

Published 17 Apr 2026, 20:16 UTC

osv:CVE-2026-33689

Complete source record

{
  "id": "ab7419a613bd658a8a084651d26d7859543b2031a6f0f6484a63b91da75473b6",
  "url": "https://osv.dev/vulnerability/CVE-2026-33689",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "xrdp: Pre-authentication out-of-bounds reads in channel parsers",
    "summary": "xrdp is an open source RDP server. Versions through 0.10.5 have an out-of-bounds read vulnerability in the pre-authentication RDP message parsing logic. A remote, unauthenticated attacker can trigger this flaw by sending a specially crafted sequence of packets during the initial connection phase. This vulnerability results from insufficient validation of input buffer lengths before processing dynamic channel communication. Successful exploitation can lead to a denial-of-service (DoS) condition via a process crash or potential disclosure of sensitive information from the service's memory space. This issue has been fixed in version 0.10.6.",
    "evidence": "osv:CVE-2026-33689",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-33689",
      "aliases": [
        "CVE-2026-33689",
        "GHSA-92mr-6wpp-27jj"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/neutrinolabs/xrdp",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "440a538149561ec8e8e57552ab8f2e0e3f273cd5"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.10.6"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "440a538149561ec8e8e57552ab8f2e0e3f273cd5"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v0.10.6"
                  },
                  {
                    "cpe": "cpe:2.3:a:neutrinolabs:xrdp:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.10.6"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.10.5",
            "v0.10.4.1",
            "v0.10.4",
            "v0.10.3",
            "v0.10.2",
            "v0.10.2-rc.1",
            "v0.10.1",
            "v0.10.0",
            "v0.10.0-beta.3",
            "v0.10.0-beta.2",
            "v0.10.0-beta.1",
            "v0.9.18",
            "v0.9.17",
            "v0.9.16",
            "v0.9.15",
            "v0.9.14",
            "v0.9.13",
            "v0.9.12",
            "v0.9.11",
            "v0.9.10",
            "v0.9.9",
            "v0.9.8",
            "v0.9.7",
            "v0.9.6",
            "v0.9.5",
            "v0.9.4",
            "v0.9.4.rc1",
            "v0.9.3",
            "v0.9.3.rc1",
            "v0.9.2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33689.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:29.105446863Z",
      "provider": "osv",
      "references": [
        "https://github.com/neutrinolabs/xrdp/releases/tag/v0.10.6",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33689.json",
        "https://github.com/neutrinolabs/xrdp/security/advisories/GHSA-92mr-6wpp-27jj",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-33689"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-125"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33689.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-33689",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 495724,
  "published_at": "2026-04-17T20:16:31.248+00:00"
}