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vuln-cve/data/2026/6xxx/CVE-2026-6091.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-6091",
"assignerOrgId": "50d2cd11-d01a-48ed-9441-5bfce9d63b27",
"state": "PUBLISHED",
"assignerShortName": "wolfSSL",
"dateReserved": "2026-04-10T16:01:23.181Z",
"datePublished": "2026-06-25T16:46:12.599Z",
"dateUpdated": "2026-06-25T17:58:31.045Z"
},
"containers": {
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"shortName": "wolfSSL",
"dateUpdated": "2026-06-25T16:46:12.599Z"
},
"title": "Partial-chain verification accepts untrusted intermediate as trust anchor",
"problemTypes": [
{
"descriptions": [
{
"lang": "en",
"cweId": "CWE-295",
"description": "CWE-295 Improper Certificate Validation",
"type": "CWE"
}
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"affected": [
{
"vendor": "wolfSSL",
"product": "wolfSSL",
"collectionURL": "https://github.com/wolfSSL/wolfssl",
"versions": [
{
"status": "affected",
"version": "5.7.4",
"lessThanOrEqual": "5.9.1",
"versionType": "semver"
}
],
"defaultStatus": "unaffected"
}
],
"descriptions": [
{
"lang": "en",
"value": "Partial-chain certificate verification may accept chains that terminate at a peer-supplied, untrusted intermediate certificate rather than a trusted anchor. An attacker could present a chain that ends at an intermediate they control and have it accepted as valid. This affects the OpenSSL compatibility certificate-path-building path (wolfSSL_X509_verify_cert / X509_STORE, OPENSSL_EXTRA) when the X509_V_FLAG_PARTIAL_CHAIN verify flag is enabled.",
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"value": "<p>Partial-chain certificate verification may accept chains that terminate at a peer-supplied, untrusted intermediate certificate rather than a trusted anchor. An attacker could present a chain that ends at an intermediate they control and have it accepted as valid. This affects the OpenSSL compatibility certificate-path-building path (wolfSSL_X509_verify_cert / X509_STORE, OPENSSL_EXTRA) when the X509_V_FLAG_PARTIAL_CHAIN verify flag is enabled.</p>"
}
]
}
],
"references": [
{
"url": "https://github.com/wolfSSL/wolfssl/pull/10170",
"tags": [
"patch"
]
},
{
"url": "https://www.wolfssl.com/docs/security-vulnerabilities/"
}
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"value": "GENERAL"
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"attackVector": "NETWORK",
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"vulnConfidentialityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "HIGH",
"subIntegrityImpact": "NONE",
"vulnAvailabilityImpact": "NONE",
"subAvailabilityImpact": "NONE",
"exploitMaturity": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"valueDensity": "NOT_DEFINED",
"vulnerabilityResponseEffort": "NOT_DEFINED",
"providerUrgency": "NOT_DEFINED",
"version": "4.0",
"baseSeverity": "MEDIUM",
"baseScore": 6,
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N"
}
}
],
"credits": [
{
"lang": "en",
"value": "Dikai Zou",
"type": "finder"
}
],
"source": {
"discovery": "UNKNOWN"
},
"x_generator": {
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},
"adp": [
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"timestamp": "2026-06-25T17:58:24.366839Z",
"id": "CVE-2026-6091",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-06-25T17:58:31.045Z"
}
}
]
}
}