CVE-2026-42476 Memory corruption in n/a

Medium 5.5 Published 1 May 2026 Updated 1 May 2026

Attackers can cause denial of service or information disclosure by tricking users into opening crafted STL files in Open CASCADE Technology.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-42476?

CVE-2026-42476 is a medium-severity memory corruption vulnerability in n/a, published on 1 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

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.

Weakness: CWE-125

Which versions are affected by CVE-2026-42476?

It affects 1 product.

Products include Opencascade Open Cascade Technology.

How do I fix CVE-2026-42476?

No fix has been published for CVE-2026-42476 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-42476 being exploited?

There is no known exploitation of CVE-2026-42476 in the wild and no public exploit code.

Sources

Also known as DEBIAN-CVE-2026-42476, GHSA-8gr4-rxj5-hxc5, UBUNTU-CVE-2026-42476.