CVE-2026-42477: Opencascade Open Cascade Technology

High severity, CVSS 7.1. EPSS: 0.1% chance of exploitation in the next 30 days.

A 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-assisted attackers to cause a denial of service or obtain sensitive information by persuading a victim to open a crafted OBJ file. The issue occurs because Standard_ReadLineBuffer::ReadLine() can return a 1-byte buffer for a minimal OBJ line, and RWObj_Reader::read() calls pushIndices(aLine + 2) without validating the buffer length.

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.