Vulnerability-Lookup

UBUNTU-CVE-2026-6210 (CVE-2026-6210)

Vulnerability from osv_ubuntu – Published: 2026-05-06 12:16 – Updated: 2026-05-27 20:27 – Source website

Details

A type confusion vulnerability in Qt SVG allows an attacker to cause an application crash via a crafted SVG image. When processing SVG marker references, the renderer retrieves a node by its id attribute and casts it to QSvgMarker* without verifying the node type. A non-marker element (such as a element) that references itself as a marker triggers an out-of-bounds heap read due to the object size difference between QSvgLine and QSvgMarker, followed by an endless recursion that bypasses the marker recursion guard through incorrect virtual dispatch. The result is an application crash (denial of service). This issue affects Qt SVG: from 6.7.0 before 6.8.8, from 6.9.0 before 6.11.1.

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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-6210	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-6210	REPORT
	https://codereview.qt-project.org/c/qt/qtsvg/+/724887	REPORT
	https://issues.oss-fuzz.com/issues/496327371	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libqt6svg6",
            "binary_version": "6.2.4-1ubuntu1"
          },
          {
            "binary_name": "libqt6svgwidgets6",
            "binary_version": "6.2.4-1ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "qt6-svg",
        "purl": "pkg:deb/ubuntu/qt6-svg@6.2.4-1ubuntu1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.2.2-2ubuntu1",
        "6.2.4-1ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libqt6svg6",
            "binary_version": "6.4.2-4ubuntu3"
          },
          {
            "binary_name": "libqt6svgwidgets6",
            "binary_version": "6.4.2-4ubuntu3"
          },
          {
            "binary_name": "qt6-svg-doc-html",
            "binary_version": "6.4.2-4ubuntu3"
          },
          {
            "binary_name": "qt6-svg-examples",
            "binary_version": "6.4.2-4ubuntu3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "qt6-svg",
        "purl": "pkg:deb/ubuntu/qt6-svg@6.4.2-4ubuntu3?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.4.2-4ubuntu1",
        "6.4.2-4ubuntu2",
        "6.4.2-4ubuntu3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libqt6svg6",
            "binary_version": "6.9.2-1"
          },
          {
            "binary_name": "libqt6svgwidgets6",
            "binary_version": "6.9.2-1"
          },
          {
            "binary_name": "qt6-svg-doc-html",
            "binary_version": "6.9.2-1"
          },
          {
            "binary_name": "qt6-svg-plugins",
            "binary_version": "6.9.2-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "qt6-svg",
        "purl": "pkg:deb/ubuntu/qt6-svg@6.9.2-1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.8.3-0ubuntu1",
        "6.9.2-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libqt6svg6",
            "binary_version": "6.10.2-2"
          },
          {
            "binary_name": "libqt6svgwidgets6",
            "binary_version": "6.10.2-2"
          },
          {
            "binary_name": "qt6-svg-doc-html",
            "binary_version": "6.10.2-2"
          },
          {
            "binary_name": "qt6-svg-plugins",
            "binary_version": "6.10.2-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "qt6-svg",
        "purl": "pkg:deb/ubuntu/qt6-svg@6.10.2-2?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.9.2-1",
        "6.9.2-4",
        "6.9.2-5",
        "6.10.2-2"
      ]
    }
  ],
  "aliases": [],
  "details": "A type confusion vulnerability in Qt SVG allows an attacker to cause an application crash via a crafted SVG image. When processing SVG marker references, the renderer retrieves a node by its id attribute and casts it to QSvgMarker* without verifying the node type. A non-marker element (such as a \u003cline\u003e element) that references itself as a marker triggers an out-of-bounds heap read due to the object size difference between QSvgLine and QSvgMarker,  followed by an endless recursion that bypasses the marker recursion guard through incorrect virtual dispatch. The result is an application crash (denial of service). This issue affects Qt SVG: from 6.7.0 before 6.8.8, from 6.9.0 before 6.11.1.",
  "id": "UBUNTU-CVE-2026-6210",
  "modified": "2026-05-27T20:27:45Z",
  "published": "2026-05-06T12:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-6210"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-6210"
    },
    {
      "type": "REPORT",
      "url": "https://codereview.qt-project.org/c/qt/qtsvg/+/724887"
    },
    {
      "type": "REPORT",
      "url": "https://issues.oss-fuzz.com/issues/496327371"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "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",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-6210"
  ]
}

CVE-2026-6210 (GCVE-0-2026-6210)

Vulnerability from cvelistv5 – Published: 2026-05-06 11:59 – Updated: 2026-07-29 08:59

Title

Type confusion and heap-buffer-overflow in Qt SVG marker handling causing application crash

Summary

A type confusion vulnerability in Qt SVG allows an attacker to cause an application crash via a crafted SVG image. When processing SVG marker references, the renderer retrieves a node by its id attribute and casts it to QSvgMarker* without verifying the node type. A non-marker element (such as a <line> element) that references itself as a marker triggers an out-of-bounds heap read due to the object size difference between QSvgLine and QSvgMarker, followed by an endless recursion that bypasses the marker recursion guard through incorrect virtual dispatch. The result is an application crash (denial of service). This issue affects Qt SVG: from 6.7.0 before 6.8.8, from 6.9.0 before 6.11.1.

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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-06 13:11 UTC

CWE

CWE-843 - Access of Resource Using Incompatible Type ('Type Confusion')
CWE-122 - Heap-based Buffer Overflow

Assigner

TQtC Scorecard

References

2 references

URL	Tags
https://codereview.qt-project.org/c/qt/qtsvg/+/724887
https://issues.oss-fuzz.com/issues/496327371

Impacted products

1 product

Vendor	Product	Version
Qt	Qt	Affected: 6.7.0 , < 6.8.8 (python) Affected: 6.9.0 , < 6.11.1 (python) cpe:2.3:a:qt:qt:::::::: cpe:2.3:a:qt:qt::::::::

Show details on NVD website

JSON

To clipboard

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                "timestamp": "2026-05-06T13:11:30.336334Z",
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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.

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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UBUNTU-CVE-2026-6210 (CVE-2026-6210)

CVE-2026-6210 (GCVE-0-2026-6210)

Tags

Sightings

Nomenclature

Related by attack behaviour