8.7

CVE-2026-6210

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.
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
HerstellerQt
≫
Produkt Qt
Default Statusunaffected
Version 6.7.0
Version < 6.8.8
Status affected
Version 6.9.0
Version < 6.11.1
Status affected
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.28% 0.194
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
a59d8014-47c4-4630-ab43-e1b13cbe58e3 8.7 0 0
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
CWE-122 Heap-based Buffer Overflow

A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

CWE-843 Access of Resource Using Incompatible Type ('Type Confusion')

The product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type.

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