Out-of-bounds read vulnerability in NTLM authentication handling impacts Qt

{
  "id": "7c7b0f5c3ea2024f3b889bf88472a2b790293aa8a70cee166d22ad3277820e87",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-105946",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Out-of-bounds read vulnerability in NTLM authentication handling impacts Qt",
    "summary": "Out-of-bounds read in the QAuthenticator NTLM authentication handling in the Qt Network module in Qt Group Qt allows remote attackers to obtain sensitive information (heap memory contents) or cause a denial of service (application crash) via a crafted NTLM challenge sent by a malicious server or proxy, when an application using QNetworkAccessManager or QTcpSocket authenticates with NTLM.",
    "evidence": "cve:CVE-2026-105946",
    "products": [
      {
        "name": {
          "value": "qt",
          "evidence": "/containers/cna/affected/0/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-105946",
      "aliases": [
        "CVE-2026-105946"
      ],
      "metrics": [
        {
          "format": "CVSS",
          "cvssV4_0": {
            "Safety": "NOT_DEFINED",
            "version": "4.0",
            "Recovery": "NOT_DEFINED",
            "baseScore": 5.3,
            "Automatable": "NOT_DEFINED",
            "attackVector": "NETWORK",
            "baseSeverity": "MEDIUM",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N/E:P",
            "exploitMaturity": "PROOF_OF_CONCEPT",
            "providerUrgency": "NOT_DEFINED",
            "userInteraction": "ACTIVE",
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "privilegesRequired": "NONE",
            "subIntegrityImpact": "NONE",
            "vulnIntegrityImpact": "NONE",
            "subAvailabilityImpact": "NONE",
            "vulnAvailabilityImpact": "HIGH",
            "subConfidentialityImpact": "NONE",
            "vulnConfidentialityImpact": "HIGH",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "affected": [
        {
          "cpes": [
            "cpe:2.3:a:qt:qt:*:*:*:*:*:*:*:*",
            "cpe:2.3:a:qt:qtbase:*:*:*:*:*:*:*:*"
          ],
          "vendor": "qt",
          "modules": [
            "qtbase"
          ],
          "product": "qt",
          "versions": [
            {
              "status": "unknown",
              "version": "0",
              "lessThan": "6.8.0",
              "versionType": "python"
            },
            {
              "status": "affected",
              "version": "6.8.0",
              "lessThan": "6.8.10",
              "versionType": "python"
            },
            {
              "status": "affected",
              "version": "6.9.0",
              "lessThan": "6.11.2",
              "versionType": "python"
            }
          ],
          "defaultStatus": "unaffected"
        }
      ],
      "modified": "2026-10-27T06:45:36.400Z",
      "provider": "cve",
      "references": [
        "https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products#CVE-2026-105946:",
        "https://codereview.qt-project.org/c/qt/qtbase/+/745457",
        "https://codereview.qt-project.org/c/qt/qtbase/+/744448",
        "https://codereview.qt-project.org/c/qt/qtbase/+/745464"
      ],
      "provider_metadata": {
        "cna": {
          "orgId": "a59d8014-47c4-4630-ab43-e1b13cbe58e3",
          "shortName": "Qt",
          "dateUpdated": "2026-10-27T06:45:36.400Z"
        }
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-105946",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/containers/cna/metrics"
  },
  "source_id": "core-cve",
  "document_id": 391502,
  "published_at": "2026-10-27T06:45:36.4+00:00"
}