CVE-2026-42478: Opencascade Open Cascade Technology

High severity, CVSS 7.5. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Opencascade Open Cascade Technology: up to and including 7.9.3; version 8.0.0 only

Published 2026-05-01. Last modified 2026-06-17.