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Vulnerability Details :

CVE-2026-6210

Summary
Assigner-TQtC
Assigner Org ID-a59d8014-47c4-4630-ab43-e1b13cbe58e3
Published At-06 May, 2026 | 11:59
Updated At-06 May, 2026 | 13:11
Rejected At-
Credits

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

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.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:TQtC
Assigner Org ID:a59d8014-47c4-4630-ab43-e1b13cbe58e3
Published At:06 May, 2026 | 11:59
Updated At:06 May, 2026 | 13:11
Rejected At:
▼CVE Numbering Authority (CNA)
Type confusion and heap-buffer-overflow in Qt SVG marker handling causing application crash

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.

Affected Products
Vendor
The Qt Company
Product
Qt
Repo
git://code.qt.io/qt/qtsvg.git
Modules
  • Qt SVG
Program Files
  • src/svg/qsvgstructure.cpp
Default Status
unaffected
Versions
Affected
  • From 6.7.0 before 6.8.8 (python)
  • From 6.9.0 before 6.11.1 (python)
Problem Types
TypeCWE IDDescription
CWECWE-843CWE-843 Access of Resource Using Incompatible Type ('Type Confusion')
CWECWE-122CWE-122 Heap-based Buffer Overflow
Type: CWE
CWE ID: CWE-843
Description: CWE-843 Access of Resource Using Incompatible Type ('Type Confusion')
Type: CWE
CWE ID: CWE-122
Description: CWE-122 Heap-based Buffer Overflow
Metrics
VersionBase scoreBase severityVector
4.08.7HIGH
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
Version: 4.0
Base score: 8.7
Base severity: HIGH
Vector:
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
Metrics Other Info
Impacts
CAPEC IDDescription
N/AApplication crash (denial of service)
N/AHeap-based buffer overflow via out-of-bounds field access on miscast pointer
N/AEndless recursion due to recursion guard bypass on miscast vtable dispatch
CAPEC ID: N/A
Description: Application crash (denial of service)
CAPEC ID: N/A
Description: Heap-based buffer overflow via out-of-bounds field access on miscast pointer
CAPEC ID: N/A
Description: Endless recursion due to recursion guard bypass on miscast vtable dispatch
Solutions

Apply fix: https://codereview.qt-project.org/c/qt/qtsvg/+/724887

Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://codereview.qt-project.org/c/qt/qtsvg/+/724887
N/A
https://issues.oss-fuzz.com/issues/496327371
N/A
Hyperlink: https://codereview.qt-project.org/c/qt/qtsvg/+/724887
Resource: N/A
Hyperlink: https://issues.oss-fuzz.com/issues/496327371
Resource: N/A
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:a59d8014-47c4-4630-ab43-e1b13cbe58e3
Published At:06 May, 2026 | 12:16
Updated At:07 May, 2026 | 15:10

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.08.7HIGH
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:X/AU:X/R:X/V:X/RE:X/U:X
Type: Secondary
Version: 4.0
Base score: 8.7
Base severity: HIGH
Vector:
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:X/AU:X/R:X/V:X/RE:X/U:X
CPE Matches
Weaknesses
CWE IDTypeSource
CWE-122Secondarya59d8014-47c4-4630-ab43-e1b13cbe58e3
CWE-843Secondarya59d8014-47c4-4630-ab43-e1b13cbe58e3
CWE ID: CWE-122
Type: Secondary
Source: a59d8014-47c4-4630-ab43-e1b13cbe58e3
CWE ID: CWE-843
Type: Secondary
Source: a59d8014-47c4-4630-ab43-e1b13cbe58e3
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://codereview.qt-project.org/c/qt/qtsvg/+/724887a59d8014-47c4-4630-ab43-e1b13cbe58e3
N/A
https://issues.oss-fuzz.com/issues/496327371a59d8014-47c4-4630-ab43-e1b13cbe58e3
N/A
Hyperlink: https://codereview.qt-project.org/c/qt/qtsvg/+/724887
Source: a59d8014-47c4-4630-ab43-e1b13cbe58e3
Resource: N/A
Hyperlink: https://issues.oss-fuzz.com/issues/496327371
Source: a59d8014-47c4-4630-ab43-e1b13cbe58e3
Resource: N/A

Change History

0
Information is not available yet

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