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

Vulnerability from cvelistv5 – Published: 2025-06-02 08:46 – Updated: 2026-07-29 07:34
VLAI
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
References
Impacted products
Vendor Product Version CPE status
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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                "vectorString": "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",
                "version": "4.0",
                "vulnAvailabilityImpact": "HIGH",
                "vulnConfidentialityImpact": "NONE",
                "vulnIntegrityImpact": "HIGH",
                "vulnerabilityResponseEffort": "MODERATE"
              },
              "format": "CVSS",
              "scenarios": [
                {
                  "lang": "en",
                  "value": "GENERAL"
                }
              ]
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-20",
                  "description": "CWE-20 Improper Input Validation",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-07-29T07:34:05.682Z",
            "orgId": "a59d8014-47c4-4630-ab43-e1b13cbe58e3",
            "shortName": "TQtC"
          },
          "references": [
            {
              "url": "https://codereview.qt-project.org/c/qt/qtbase/+/642006"
            }
          ],
          "source": {
            "discovery": "INTERNAL"
          },
          "title": "Possible denial of service when passing malformed data in a URL to qDecodeDataUrl",
          "x_generator": {
            "engine": "Vulnogram 0.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "a59d8014-47c4-4630-ab43-e1b13cbe58e3",
        "assignerShortName": "TQtC",
        "cveId": "CVE-2025-5455",
        "datePublished": "2025-06-02T08:46:20.524Z",
        "dateReserved": "2025-06-02T08:31:36.081Z",
        "dateUpdated": "2026-07-29T07:34:05.682Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.



Related by attack behaviour

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.