Vulnerability · Published May 1, 2026 · Assigned by mitre
CVE-2026-42478
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 0.2% (higher than 12% of all known vulnerabilities).
Severity (CVSS 3.1)5.5Medium
Exploit odds (30 days)0.2%top 87.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
An issue was discovered in VrmlData_IndexedFaceSet::TShape in the VRML V2.0 parser in Open CASCADE Technology (OCCT) V8_0_0_rc5 allows attackers to cause a denial of service via a crafted VRML file. The issue occurs because malformed VRML input can trigger dereference of a corrupt or unvalidated pointer during shape construction in libTKDEVRML.so.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | opencascade | no fix listed | DEBIAN-CVE-2026-42478 |
| Debian:13 | opencascade | no fix listed | DEBIAN-CVE-2026-42478 |
| Debian:14 | opencascade | no fix listed | DEBIAN-CVE-2026-42478 |
| Ubuntu:22.04:LTS | opencascade | no fix listed | UBUNTU-CVE-2026-42478 |
| Ubuntu:24.04:LTS | opencascade | no fix listed | UBUNTU-CVE-2026-42478 |
| Ubuntu:25.10 | opencascade | no fix listed | UBUNTU-CVE-2026-42478 |
| Ubuntu:26.04:LTS | opencascade | no fix listed | UBUNTU-CVE-2026-42478 |
| Ubuntu:26.10 | opencascade | no fix listed | UBUNTU-CVE-2026-42478 |
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