CVE-2026-42477
A heap-based out-of-bounds read vulnerability in RWObj_Reader::read in the OBJ file parser in...
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.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
7.1
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.
- Record
CVE-2026-42477- CVSS 3.1
- 7.1 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H - CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-125, CWE-122
- Updated
- 2026-11-02
CVE List
5.5
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.
- Record
CVE-2026-42477- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-122
- Updated
- 2026-11-02
EUVDEUVD-2026-26600
5.5
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.
- Record
EUVD-2026-26600- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-3vcm-9wgv-947g
7.1
A heap-based out-of-bounds read vulnerability in RWObj_Reader::read in the OBJ file parser in...
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.
- Record
GHSA-3vcm-9wgv-947g- CVSS 3.1
- 7.1 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H - Weakness
- CWE-122, CWE-125
- Updated
- 2026-11-02
OSV
5.5
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.
- Record
CVE-2026-42477- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVDEBIAN-CVE-2026-42477
7.1
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.
- Record
DEBIAN-CVE-2026-42477- CVSS 3.1
- 7.1 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H - Updated
- 2026-11-02
OSVUBUNTU-CVE-2026-42477
7.1
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.
- Record
UBUNTU-CVE-2026-42477- CVSS 3.1
- 7.1 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H - CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
opencascadeDebian:12 |
All versions, plus listed versions 7.6.3+dfsg1-77.6.3+dfsg1-7.17.7.1+dfsg1-1~exp17.7.1+dfsg1-1~exp27.8.1+dfsg1-1 Show 14 moreShow less7.8.1+dfsg1-1~exp17.8.1+dfsg1-27.8.1+dfsg1-37.8.1+dfsg1-4~exp17.8.1+dfsg1-57.8.1+dfsg1-67.8.1+dfsg1-77.9.1+dfsg-1~exp17.9.1+dfsg-1~exp27.9.2+dfsg-17.9.2+dfsg-27.9.2+dfsg-37.9.2+dfsg-47.9.2+dfsg-5 |
None known |
opencascadeDebian:13 |
All versions, plus listed versions 7.8.1+dfsg1-37.8.1+dfsg1-4~exp17.8.1+dfsg1-57.8.1+dfsg1-67.8.1+dfsg1-7 Show 7 moreShow less7.9.1+dfsg-1~exp17.9.1+dfsg-1~exp27.9.2+dfsg-17.9.2+dfsg-27.9.2+dfsg-37.9.2+dfsg-47.9.2+dfsg-5 |
None known |
opencascadeDebian:14 |
All versions, plus listed versions 7.8.1+dfsg1-37.8.1+dfsg1-4~exp17.8.1+dfsg1-57.8.1+dfsg1-67.8.1+dfsg1-7 Show 7 moreShow less7.9.1+dfsg-1~exp17.9.1+dfsg-1~exp27.9.2+dfsg-17.9.2+dfsg-27.9.2+dfsg-37.9.2+dfsg-47.9.2+dfsg-5 |
None known |
opencascadeUbuntu:20.04:LTS |
All versions, plus listed versions 7.3.3+dfsg1-17.3.3+dfsg1-1build1 |
None known |
opencascadeUbuntu:22.04:LTS |
All versions, plus listed versions 7.5.1+dfsg1-27.5.1+dfsg1-2ubuntu1 |
None known |
opencascadeUbuntu:24.04:LTS |
All versions, plus listed versions 7.6.3+dfsg1-77.6.3+dfsg1-7.17.6.3+dfsg1-7.1build1 |
None known |
opencascadeUbuntu:25.10 |
All versions, plus listed versions 7.8.1+dfsg1-3 |
None known |
opencascadeUbuntu:26.10 |
All versions, plus listed versions 7.9.2+dfsg-47.9.2+dfsg-4build1 |
None known |
opencascadeUbuntu:26.04:LTS |
All versions, plus listed versions 7.8.1+dfsg1-37.9.2+dfsg-27.9.2+dfsg-37.9.2+dfsg-4 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-42477 is a high vulnerability (CVSS 7.1) in Opencascade Open Cascade Technology, published May 1, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.10%, the 1st percentile. No source names a fixed version.
References
gist.github.com/sgInnora/dfba083d04906283e9c92aea78e2d94a
nvd.nist.gov/vuln/detail/CVE-2026-42477
github.com/advisories/GHSA-3vcm-9wgv-947g
github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42477.json
security-tracker.debian.org/tracker/CVE-2026-42477
ubuntu.com/security/CVE-2026-42477
cve.org/CVERecord?id=CVE-2026-42477