Vulnerability · Published May 1, 2026 · Assigned by mitre
CVE-2026-42476
Medium 5.5
In plain English
A medium-severity out-of-bounds read in the opencascade package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 1% of all known vulnerabilities).
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | opencascade | no fix listed | DEBIAN-CVE-2026-42476 |
| Debian:13 | opencascade | no fix listed | DEBIAN-CVE-2026-42476 |
| Debian:14 | opencascade | no fix listed | DEBIAN-CVE-2026-42476 |
| Ubuntu:22.04:LTS | opencascade | no fix listed | UBUNTU-CVE-2026-42476 |
| Ubuntu:24.04:LTS | opencascade | no fix listed | UBUNTU-CVE-2026-42476 |
| Ubuntu:25.10 | opencascade | no fix listed | UBUNTU-CVE-2026-42476 |
| Ubuntu:26.04:LTS | opencascade | no fix listed | UBUNTU-CVE-2026-42476 |
| Ubuntu:26.10 | opencascade | no fix listed | UBUNTU-CVE-2026-42476 |
Affected products (as reported)
Weakness: CWE-125 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H