CVE-2026-42481: Opencascade Open Cascade Technology

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

Open CASCADE Technology (OCCT) V8_0_0_rc5 contains multiple vulnerabilities in its IGES and STEP file parsers that can be triggered by crafted IGES or STEP files. These issues include an out-of-bounds read in Geom2d_BSplineCurve::EvalD0 during IGES B-spline curve evaluation, an out-of-bounds read in MakeBSplineCurveCommon during STEP B-spline curve construction, and infinite recursion in StepShape_OrientedEdge::EdgeStart when processing a self-referential OrientedEdge entity. Successful exploitation may result in denial of service or unintended memory disclosure.

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.