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Vulnerability record · CVE-2026-42478 · published 1 May 2026

CVE-2026-42478: Opencascade open cascade technology null pointer dereference vulnerability

Opencascade · Open Cascade Technology

An issue was discovered in VrmlData_IndexedFaceSet::TShape in the VRML V2.0 parser in Open CASCADE Technology (OCCT) V8_0_0_rc5 allows attackers to cause a denial of service via a crafted VRML file. The issue occurs because malformed VRML input can trigger dereference of a corrupt or unvalidated pointer during shape construction in libTKDEVRML.so.

7.5 CVSS 3.1 High EPSS 0.30% · top 79.2% CWE-476 · NULL pointer dereferenceCWE-125 · Out-of-bounds read
7.5CVSS 3.1 base score
0.30%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References
17 Jun 2026Last modified by NVD

Description

An issue was discovered in VrmlData_IndexedFaceSet::TShape in the VRML V2.0 parser in Open CASCADE Technology (OCCT) V8_0_0_rc5 allows attackers to cause a denial of service via a crafted VRML file. The issue occurs because malformed VRML input can trigger dereference of a corrupt or unvalidated pointer during shape construction in libTKDEVRML.so.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://gist.github.com/sgInnora/dfba083d04906283e9c92aea78e2d94a Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.1CVE-2026-42476Opencascade open cascade technology out-of-bounds read vulnerabilityTwo heap-based out-of-bounds read vulnerabilities in the STL ASCII file parser in Open CASCADE Technology (OCCT) V8_0_0_rc5 exist in RWStl_Reader::Re…EPSS 0.14%7.1CVE-2026-42477Opencascade open cascade technology out-of-bounds read vulnerabilityA heap-based out-of-bounds read vulnerability in RWObj_Reader::read in the OBJ file parser in Open CASCADE Technology (OCCT) V8_0_0_rc5 allows user-a…EPSS 0.14%5.5CVE-2026-42480Opencascade open cascade technology out-of-bounds read vulnerabilityA stack-based out-of-bounds read vulnerability in VrmlData_Scene::ReadLine in the VRML parser in Open CASCADE Technology (OCCT) V8_0_0_rc5 allows att…EPSS 0.14%5.5CVE-2026-42481Opencascade open cascade technology out-of-bounds read vulnerabilityOpen CASCADE Technology (OCCT) V8_0_0_rc5 contains multiple vulnerabilities in its IGES and STEP file parsers that can be triggered by crafted IGES o…EPSS 0.14%5.5CVE-2026-42479Opencascade open cascade technology out-of-bounds read vulnerabilityAn out-of-bounds read vulnerability in VrmlData_IndexedLineSet::TShape in the VRML parser in Open CASCADE Technology (OCCT) V8_0_0_rc5 allows attacke…EPSS 0.13%6.2CVE-2026-21525Windows Remote Access Connection Manager null pointer dereference DoSWindows Remote Access Connection Manager contains a null pointer dereference (CWE-476) that lets an unauthorized attacker deny service locally. The f…KEVEPSS 4.8%analysed

Source: NIST National Vulnerability Database (record CVE-2026-42478), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.