CVE-2026-42476

High

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.

SeverityHigh

CVSS7.1

Exploit probability—

ProductOpencascade Open Cascade Technology

PublishedMay 1, 2026

First seenMay 1, 2026

Weakness typeCWE-125Out-of-bounds read

How to fix

Sources list no fixed version or patch link for this vulnerability.

Affected products

Product	Affected versions	Fixed in
opencascade open_cascade_technology	v ≤ 7.9.3, 8.0.0	—

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