Vulnerability-Lookup

CVE-2026-16762 (GCVE-0-2026-16762)

Vulnerability from cvelistv5 – Published: 2026-10-23 08:58 – Updated: 2026-10-23 10:56

Title

Denial-of-service vulnerability in the Qt Core QXmlStream parser (QXmlStreamReader) impacts Qt

Summary

An attacker able to supply a crafted XML document to an application using QXmlStreamReader can cause disproportionate CPU consumption during parsing, making the application unresponsive (denial of service). Exploitation requires only that the application parse attacker-influenced XML; no authentication, privileges, or user interaction beyond ingesting the input are needed. There is no loss of confidentiality or integrity — no data disclosure, data modification, or code execution — and the impact is contained to the affected process.

Severity

8.7 (High)


                        
                          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/S:P/AU:Y/R:A/RE:L

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-23 10:43 UTC

CWE

CWE-407 - Inefficient Algorithmic Complexity

Assigner

Qt CNA under the mitre root

CNA scorecard A 92/100 over 15 records in the last 180 days details

References

3 references

URL	Tags
https://wiki.qt.io/List_of_known_vulnerabilities_…	vendor-advisory
https://codereview.qt-project.org/c/qt/qtbase/+/738885	patch
https://codereview.qt-project.org/c/qt/qtbase/+/738901	patch

Impacted products

1 product

Vendor	Product	Version	CPE status
qt	qt	Unknown: 0 , < 4.3.0 (python) Affected: 4.3.0 , < 6.8.9 (python) Affected: 6.9.0 , < 6.11.2 (python) cpe:2.3:a:qt:qt:::::::: cpe:2.3:a:qt:qt:::::::: cpe:2.3:a:qt:qtbase:::::::: cpe:2.3:a:qt:qtbase::::::::

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-16762

Vulnerability from fkie_nvd - Published: 2026-10-23 09:17 - Updated: 2026-10-23 19:45

Severity

8.7 (High) - 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/S:P/AU:Y/R:A/RE:L

Summary

References

	URL	Tags
	a59d8014-47c4-4630-ab43-e1b13cbe58e3	https://codereview.qt-project.org/c/qt/qtbase/+/738885
	a59d8014-47c4-4630-ab43-e1b13cbe58e3	https://codereview.qt-project.org/c/qt/qtbase/+/738901
	a59d8014-47c4-4630-ab43-e1b13cbe58e3	https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products#CVE-2026-16762:

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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    {
      "lang": "en",
      "value": "An attacker able to supply a crafted XML document to an application using QXmlStreamReader can cause disproportionate CPU consumption during parsing, making the application unresponsive (denial of service). Exploitation requires only that the application parse attacker-influenced XML; no authentication, privileges, or user interaction beyond ingesting the input are needed. There is no loss of confidentiality or integrity \u2014 no data disclosure, data modification, or code execution \u2014 and the impact is contained to the affected process."
    }
  ],
  "id": "CVE-2026-16762",
  "lastModified": "2026-10-23T19:45:03.547",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "YES",
          "Recovery": "AUTOMATIC",
          "Safety": "PRESENT",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 8.7,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:P/AU:Y/R:A/V:X/RE:L/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "HIGH",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "LOW"
        },
        "source": "a59d8014-47c4-4630-ab43-e1b13cbe58e3",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-16762",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-10-23T10:43:53.436456Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-10-23T09:17:06.647",
  "references": [
    {
      "source": "a59d8014-47c4-4630-ab43-e1b13cbe58e3",
      "url": "https://codereview.qt-project.org/c/qt/qtbase/+/738885"
    },
    {
      "source": "a59d8014-47c4-4630-ab43-e1b13cbe58e3",
      "url": "https://codereview.qt-project.org/c/qt/qtbase/+/738901"
    },
    {
      "source": "a59d8014-47c4-4630-ab43-e1b13cbe58e3",
      "url": "https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products#CVE-2026-16762:"
    }
  ],
  "sourceIdentifier": "a59d8014-47c4-4630-ab43-e1b13cbe58e3",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-407"
        }
      ],
      "source": "a59d8014-47c4-4630-ab43-e1b13cbe58e3",
      "type": "Secondary"
    }
  ]
}

GHSA-3GXV-QXPH-7HG3

Vulnerability from github – Published: 2026-10-23 09:31 – Updated: 2026-10-23 09:31

Details

Severity

8.7 (High)


                  
                    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/S:P/AU:Y/R:A/RE:L

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-16762"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-407"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-23T09:17:06Z",
    "severity": "HIGH"
  },
  "details": "An attacker able to supply a crafted XML document to an application using QXmlStreamReader can cause disproportionate CPU consumption during parsing, making the application unresponsive (denial of service). Exploitation requires only that the application parse attacker-influenced XML; no authentication, privileges, or user interaction beyond ingesting the input are needed. There is no loss of confidentiality or integrity \u2014 no data disclosure, data modification, or code execution \u2014 and the impact is contained to the affected process.",
  "id": "GHSA-3gxv-qxph-7hg3",
  "modified": "2026-10-23T09:31:23Z",
  "published": "2026-10-23T09:31:23Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-16762"
    },
    {
      "type": "WEB",
      "url": "https://codereview.qt-project.org/c/qt/qtbase/+/738885"
    },
    {
      "type": "WEB",
      "url": "https://codereview.qt-project.org/c/qt/qtbase/+/738901"
    },
    {
      "type": "WEB",
      "url": "https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products#CVE-2026-16762:"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:P/AU:Y/R:A/V:X/RE:L/U:X",
      "type": "CVSS_V4"
    }
  ]
}

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.
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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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CVE-2026-16762 (GCVE-0-2026-16762)

FKIE_CVE-2026-16762

GHSA-3GXV-QXPH-7HG3

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