CVE-2026-42477
Open CASCADE Technology (OCCT) Heap-Based Out-of-Bounds Read Vulnerability
Description
A heap-based out-of-bounds read vulnerability in RWObj_Reader::read in the OBJ file parser in Open CASCADE Technology (OCCT) V8_0_0_rc5 allows user-assisted attackers to cause a denial of service or obtain sensitive information by persuading a victim to open a crafted OBJ file. The issue occurs because Standard_ReadLineBuffer::ReadLine() can return a 1-byte buffer for a minimal OBJ line, and RWObj_Reader::read() calls pushIndices(aLine + 2) without validating the buffer length.
INFO
Published Date :
May 1, 2026, 3:16 p.m.
Last Modified :
May 1, 2026, 5:48 p.m.
Remotely Exploit :
No
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update Open CASCADE Technology to a patched version.
- Avoid opening untrusted OBJ files.
- Validate buffer lengths before memory access.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-42477.
| URL | Resource |
|---|---|
| https://gist.github.com/sgInnora/dfba083d04906283e9c92aea78e2d94a | Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-42477 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-42477
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-42477 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-42477 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
May. 01, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H Added CWE CWE-125 Added CPE Configuration OR *cpe:2.3:a:opencascade:open_cascade_technology:*:*:*:*:*:*:*:* versions up to (including) 7.9.3 *cpe:2.3:a:opencascade:open_cascade_technology:8.0.0:beta1:*:*:*:*:*:* *cpe:2.3:a:opencascade:open_cascade_technology:8.0.0:rc1:*:*:*:*:*:* *cpe:2.3:a:opencascade:open_cascade_technology:8.0.0:rc2:*:*:*:*:*:* *cpe:2.3:a:opencascade:open_cascade_technology:8.0.0:rc3:*:*:*:*:*:* *cpe:2.3:a:opencascade:open_cascade_technology:8.0.0:rc4:*:*:*:*:*:* *cpe:2.3:a:opencascade:open_cascade_technology:8.0.0:rc5:*:*:*:*:*:* Added Reference Type MITRE: https://gist.github.com/sgInnora/dfba083d04906283e9c92aea78e2d94a Types: Third Party Advisory -
New CVE Received by [email protected]
May. 01, 2026
Action Type Old Value New Value Added Description A heap-based out-of-bounds read vulnerability in RWObj_Reader::read in the OBJ file parser in Open CASCADE Technology (OCCT) V8_0_0_rc5 allows user-assisted attackers to cause a denial of service or obtain sensitive information by persuading a victim to open a crafted OBJ file. The issue occurs because Standard_ReadLineBuffer::ReadLine() can return a 1-byte buffer for a minimal OBJ line, and RWObj_Reader::read() calls pushIndices(aLine + 2) without validating the buffer length. Added Reference https://gist.github.com/sgInnora/dfba083d04906283e9c92aea78e2d94a