Out-of-bounds Read in Opencascade Open Cascade Technology
CVE-2026-42481
Open CASCADE Technology (OCCT) V8_0_0_rc5 contains multiple vulnerabilities in its IGES and STEP file parsers that can be triggered by crafted IGES or STEP files. These issues include an out-of-bounds read in Geom2d_BSplineCurve::EvalD0 during IGES B-spline curve evaluation, an out-of-bounds read in MakeBSplineCurveCommon during STEP B-spline curve construction, and infinite recursion in StepShape_OrientedEdge::EdgeStart when processing a self-referential OrientedEdge entity. Successful exploitation may result in denial of service or unintended memory disclosure.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.001 (2.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 3rd percentile — 2.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: +0.000
Affected products
- Opencascade Open Cascade Technology — versions 8.0.0
Weakness classification (CWE)
References
- gist.github.com/sgInnora/dfba083d04906283e9c92aea78e2d94a (Third Party Advisory)
Frequently asked questions
- What is CVE-2026-42481?
- CVE-2026-42481 is a medium-severity vulnerability in Opencascade Open Cascade Technology, classified under Out-of-bounds Read. CVSS score: 5.5/10. Published 2026-05-01.
- How severe is CVE-2026-42481?
- Medium severity. CVSS v3 base score is 5.5 out of 10.