CVE-2026-42479: Opencascade Open Cascade Technology

Medium severity, CVSS 5.5. EPSS: 0.1% chance of exploitation in the next 30 days.

An out-of-bounds read vulnerability in VrmlData_IndexedLineSet::TShape in the VRML 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 coordIndex values from parsed input are used as direct array indices without validation against the size of the coordinate array during geometry processing.

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.