CVE-2026-42476: Two heap-based out-of-bounds read vulnerabilities in the STL ASCII file parser in Open CASCADE Technology (OCCT)…
CVE-2026-42476 · Severity: high · CVSS 7.1 · Published 2026-05-01
Two 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::ReadAscii because buffers returned by Standard_ReadLineBuffer::ReadLine() are not properly length-validated before strncasecmp or direct byte access. User-assisted attackers can trigger these issues by persuading a victim to open a crafted STL file with extremely short lines, resulting in a denial of service or possible information disclosure.
No. Junglewise Threat Intelligence has no report of CVE-2026-42476 being exploited in the wild.
How severe is CVE-2026-42476?
High severity, with a CVSS score of 7.1, published 1 May 2026.
Which products and versions are affected?
Opencascade Open Cascade Technology. The advisory does not name versions.
Is there a fix for CVE-2026-42476?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
Am I affected by CVE-2026-42476?
Check whether you run Opencascade Open Cascade Technology. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.