Vulnerability-Lookup

GHSA-5CFG-QHV9-4842

Vulnerability from github – Published: 2025-06-02 09:31 – Updated: 2025-06-02 09:31

Details

An issue was found in the private API function qDecodeDataUrl() in QtCore, which is used in QTextDocument and QNetworkReply, and, potentially, in user code.

If the function was called with malformed data, for example, an URL that contained a "charset" parameter that lacked a value (such as "data:charset,"), and Qt was built with assertions enabled, then it would hit an assertion, resulting in a denial of service (abort).

This impacts Qt up to 5.15.18, 6.0.0->6.5.8, 6.6.0->6.8.3 and 6.9.0. This has been fixed in 5.15.19, 6.5.9, 6.8.4 and 6.9.1.

Severity

8.4 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:H/SC:N/SI:H/SA:H/R:U/RE:M/U:Clear

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{
  "affected": [],
  "aliases": [
    "CVE-2025-5455"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-20"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-06-02T09:15:21Z",
    "severity": "HIGH"
  },
  "details": "An issue was found in the private API function qDecodeDataUrl() in QtCore, which is used in QTextDocument and QNetworkReply, and, potentially, in user code.\n\nIf the function was called with malformed data, for example, an URL that\ncontained a \"charset\" parameter that lacked a value (such as\n\"data:charset,\"), and Qt was built with assertions enabled, then it would hit an assertion, resulting in a denial of service\n(abort).\n\nThis impacts Qt up to 5.15.18, 6.0.0-\u003e6.5.8, 6.6.0-\u003e6.8.3 and 6.9.0. This has been fixed in 5.15.19, 6.5.9, 6.8.4 and 6.9.1.",
  "id": "GHSA-5cfg-qhv9-4842",
  "modified": "2025-06-02T09:31:03Z",
  "published": "2025-06-02T09:31:02Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-5455"
    },
    {
      "type": "WEB",
      "url": "https://codereview.qt-project.org/c/qt/qtbase/+/642006"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:H/SC:N/SI:H/SA:H/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:X/AU:X/R:U/V:X/RE:M/U:Clear",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2025-5455 (GCVE-0-2025-5455)

Vulnerability from cvelistv5 – Published: 2025-06-02 08:46 – Updated: 2026-07-29 07:34

Title

Possible denial of service when passing malformed data in a URL to qDecodeDataUrl

Summary

An issue was found in the private API function qDecodeDataUrl() in QtCore, which is used in QTextDocument and QNetworkReply, and, potentially, in user code. If the function was called with malformed data, for example, an URL that contained a "charset" parameter that lacked a value (such as "data:charset,"), and Qt was built with assertions enabled, then it would hit an assertion, resulting in a denial of service (abort). This impacts Qt up to 5.15.18, 6.0.0->6.5.8, 6.6.0->6.8.3 and 6.9.0. This has been fixed in 5.15.19, 6.5.9, 6.8.4 and 6.9.1.

Severity

8.4 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:H/SC:N/SI:H/SA:H/R:U/RE:M/U:Clear

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-06-02 12:39 UTC

CWE

CWE-20 - Improper Input Validation

Assigner

TQtC CNA

CNA scorecard – unranked: 7 records in the last 180 days, 10 needed details

References

1 reference

URL	Tags
https://codereview.qt-project.org/c/qt/qtbase/+/642006

Impacted products

1 product

Vendor	Product	Version
Qt	Qt	Affected: 0 , ≤ 5.15.18 (python) Affected: 6.0.0 , ≤ 6.5.8 (python) Unaffected: 6.5.9 (python) Affected: 6.6.0 , ≤ 6.8.3 (python) Unaffected: 6.8.4 (python) Affected: 6.9.0 (python) Unaffected: 6.9.1 (python) cpe:2.3:a:qt:qt:::::::: cpe:2.3:a:qt:qt:::::::: cpe:2.3:a:qt:qt:::::::: cpe:2.3:a:qt:qt:6.9.0:::::::*

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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.

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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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