CVE-2025-5455 (GCVE-0-2025-5455)
Vulnerability from cvelistv5 – Published: 2025-06-02 08:46 – Updated: 2026-07-29 07:34
VLAI
EPSS
VEX
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
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
References
1 reference
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:*:*:*:*:*:*:* |
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2025-5455",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2025-06-02T12:39:49.722519Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2025-06-02T12:42:34.203Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Qt",
"vendor": "Qt",
"versions": [
{
"lessThanOrEqual": "5.15.18",
"status": "affected",
"version": "0",
"versionType": "python"
},
{
"lessThanOrEqual": "6.5.8",
"status": "affected",
"version": "6.0.0",
"versionType": "python"
},
{
"status": "unaffected",
"version": "6.5.9",
"versionType": "python"
},
{
"lessThanOrEqual": "6.8.3",
"status": "affected",
"version": "6.6.0",
"versionType": "python"
},
{
"status": "unaffected",
"version": "6.8.4",
"versionType": "python"
},
{
"status": "affected",
"version": "6.9.0",
"versionType": "python"
},
{
"status": "unaffected",
"version": "6.9.1",
"versionType": "python"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:qt:qt:*:*:*:*:*:*:*:*",
"versionEndIncluding": "5.15.18",
"versionStartIncluding": "0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:qt:qt:*:*:*:*:*:*:*:*",
"versionEndIncluding": "6.5.8",
"versionStartIncluding": "6.0.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:qt:qt:6.5.9:*:*:*:*:*:*:*",
"vulnerable": false
},
{
"criteria": "cpe:2.3:a:qt:qt:*:*:*:*:*:*:*:*",
"versionEndIncluding": "6.8.3",
"versionStartIncluding": "6.6.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:qt:qt:6.8.4:*:*:*:*:*:*:*",
"vulnerable": false
},
{
"criteria": "cpe:2.3:a:qt:qt:6.9.0:*:*:*:*:*:*:*",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:qt:qt:6.9.1:*:*:*:*:*:*:*",
"vulnerable": false
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "OR"
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eAn issue was found in the private API function qDecodeDataUrl() in QtCore, which is used in QTextDocument and QNetworkReply, and, potentially, in user code.\u003c/p\u003e\u003cp\u003eIf 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).\u003c/p\u003e\u003cp\u003eThis impacts Qt up to 5.15.18, 6.0.0-\u0026gt;6.5.8, 6.6.0-\u0026gt;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.\u003c/p\u003e\u003cbr\u003e"
}
],
"value": "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\n\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\n\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."
}
],
"metrics": [
{
"cvssV4_0": {
"Automatable": "NOT_DEFINED",
"Recovery": "USER",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"baseScore": 8.4,
"baseSeverity": "HIGH",
"exploitMaturity": "NOT_DEFINED",
"privilegesRequired": "NONE",
"providerUrgency": "CLEAR",
"subAvailabilityImpact": "HIGH",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "HIGH",
"userInteraction": "ACTIVE",
"valueDensity": "NOT_DEFINED",
"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",
"vulnerability-lookup:meta": {
"vulnrichment": {
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2025-5455",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2025-06-02T12:39:49.722519Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2025-06-02T12:42:02.535Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Qt",
"vendor": "Qt",
"versions": [
{
"lessThanOrEqual": "5.15.18",
"status": "affected",
"version": "0",
"versionType": "python"
},
{
"lessThanOrEqual": "6.5.8",
"status": "affected",
"version": "6.0.0",
"versionType": "python"
},
{
"status": "unaffected",
"version": "6.5.9",
"versionType": "python"
},
{
"lessThanOrEqual": "6.8.3",
"status": "affected",
"version": "6.6.0",
"versionType": "python"
},
{
"status": "unaffected",
"version": "6.8.4",
"versionType": "python"
},
{
"status": "affected",
"version": "6.9.0",
"versionType": "python"
},
{
"status": "unaffected",
"version": "6.9.1",
"versionType": "python"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:qt:qt:*:*:*:*:*:*:*:*",
"versionEndIncluding": "5.15.18",
"versionStartIncluding": "0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:qt:qt:*:*:*:*:*:*:*:*",
"versionEndIncluding": "6.5.8",
"versionStartIncluding": "6.0.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:qt:qt:6.5.9:*:*:*:*:*:*:*",
"vulnerable": false
},
{
"criteria": "cpe:2.3:a:qt:qt:*:*:*:*:*:*:*:*",
"versionEndIncluding": "6.8.3",
"versionStartIncluding": "6.6.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:qt:qt:6.8.4:*:*:*:*:*:*:*",
"vulnerable": false
},
{
"criteria": "cpe:2.3:a:qt:qt:6.9.0:*:*:*:*:*:*:*",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:qt:qt:6.9.1:*:*:*:*:*:*:*",
"vulnerable": false
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "OR"
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eAn issue was found in the private API function qDecodeDataUrl() in QtCore, which is used in QTextDocument and QNetworkReply, and, potentially, in user code.\u003c/p\u003e\u003cp\u003eIf 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).\u003c/p\u003e\u003cp\u003eThis impacts Qt up to 5.15.18, 6.0.0-\u0026gt;6.5.8, 6.6.0-\u0026gt;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.\u003c/p\u003e\u003cbr\u003e"
}
],
"value": "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\n\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\n\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."
}
],
"metrics": [
{
"cvssV4_0": {
"Automatable": "NOT_DEFINED",
"Recovery": "USER",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"baseScore": 8.4,
"baseSeverity": "HIGH",
"exploitMaturity": "NOT_DEFINED",
"privilegesRequired": "NONE",
"providerUrgency": "CLEAR",
"subAvailabilityImpact": "HIGH",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "HIGH",
"userInteraction": "ACTIVE",
"valueDensity": "NOT_DEFINED",
"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"
}
}
}
Loading…
Loading…
Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
Loading timeline…
Loading…
Loading…
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.
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.
Loading…
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.