Medium
Security advisory
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-42476
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 2 Nov 2026, 21:19 UTC · Revision 1
Source evidence
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.
osv:CVE-2026-42476
Complete source record
{
"id": "57e56883045c5df222ff64f528155eb5919e00c44f3e89faf27ac57c1e317a70",
"url": "https://osv.dev/vulnerability/CVE-2026-42476",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2026-42476",
"summary": "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.",
"evidence": "osv:CVE-2026-42476",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-42476",
"aliases": [
"CVE-2026-42476"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/open-cascade-sas/occt",
"type": "GIT",
"events": [
{
"introduced": "0"
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{
"last_affected": "a016080bf6738d6aeae020badee4e888ad1540a5"
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{
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},
{
"last_affected": "0ebbbedb239d6fffb7e1c8c2d36970a3ab1d9300"
}
],
"database_specific": {
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"cpe": "cpe:2.3:a:opencascade:open_cascade_technology:*:*:*:*:*:*:*:*",
"range": [
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"introduced": "0"
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{
"last_affected": "7.9.3"
}
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"source": "CPE_RANGE"
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{
"cpe": "cpe:2.3:a:opencascade:open_cascade_technology:8.0.0:beta1:*:*:*:*:*:*",
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{
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{
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"range": [
{
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{
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{
"cpe": "cpe:2.3:a:opencascade:open_cascade_technology:8.0.0:rc4:*:*:*:*:*:*",
"range": [
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{
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"range": [
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],
"versions": [
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"8.0.0-rc1",
"8.0.0-rc2",
"8.0.0-rc3",
"8.0.0-rc4",
"8.0.0-rc5",
"V8_0_0_rc5",
"V8_0_0_rc4",
"V8_0_0_rc3",
"V7_9_3",
"V7_9_2",
"V7_9_1",
"V8_0_0_rc2",
"V7_9_0",
"V8_0_0_rc1",
"V7_9_0_beta2",
"V7_9_0_beta1",
"V7_8_0",
"V7_7_0",
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"V7_4_0",
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"V7_1_0",
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"V7_1_0_beta",
"V7_0_0rc",
"V7_0_0_beta",
"V6_9_0",
"V6_9_0_beta2",
"V6_9_0_beta1",
"V6_9_0_beta",
"V6_8_0",
"V6_8_0_beta",
"V6_7_0",
"V6_7_0_beta",
"V6_6_0",
"V6_6_0_beta",
"V6_5_4",
"V6_5_4_beta1",
"V6_5_3",
"V6_5_3_beta1",
"V6_5_2",
"V6_5_1",
"V6_5_0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42476.json"
}
}
],
"modified": "2026-10-28T02:30:23.611433457Z",
"provider": "osv",
"references": [
"https://gist.github.com/sgInnora/dfba083d04906283e9c92aea78e2d94a",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42476.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-42476"
],
"provider_metadata": {
"cna_assigner": "mitre",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42476.json"
}
},
"related_cves": [
{
"value": "CVE-2026-42476",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 490213,
"published_at": "2026-05-01T00:00:00+00:00"
}