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vuln-cve/data/2026/6xxx/CVE-2026-6691.json
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{
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"cveMetadata": {
"cveId": "CVE-2026-6691",
"assignerOrgId": "a39b4221-9bd0-4244-95fc-f3e2e07f1deb",
"state": "PUBLISHED",
"assignerShortName": "mongodb",
"dateReserved": "2026-04-20T16:17:41.724Z",
"datePublished": "2026-05-06T15:08:23.671Z",
"dateUpdated": "2026-05-07T03:55:47.410Z"
},
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"shortName": "mongodb",
"dateUpdated": "2026-05-06T15:08:23.671Z"
},
"title": "MongoDB C Driver Cyrus SASL Canonicalization Buffer Overflow",
"problemTypes": [
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"descriptions": [
{
"lang": "en",
"cweId": "CWE-120",
"description": "CWE-120 Buffer Copy without Checking Size of Input",
"type": "CWE"
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"capecId": "CAPEC-100",
"descriptions": [
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"value": "CAPEC-100 Overflow Buffers"
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"version": "2.1.0",
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"versionType": "semver"
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"value": "The MongoDB C Driver's Cyrus SASL integration performs unsafe string copying during username canonicalization, enabling a heap buffer overflow before any authentication or network traffic. This may be triggered by passing untrusted input in the username of a MongoDB URI with authMechanism=GSSAPI.",
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"url": "https://jira.mongodb.org/browse/CDRIVER-6134"
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"privilegesRequired": "NONE",
"userInteraction": "NONE",
"vulnConfidentialityImpact": "HIGH",
"subConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "HIGH",
"subIntegrityImpact": "NONE",
"vulnAvailabilityImpact": "HIGH",
"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",
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"baseScore": 8.6,
"vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
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"attackComplexity": "LOW",
"privilegesRequired": "NONE",
"userInteraction": "REQUIRED",
"scope": "UNCHANGED",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"availabilityImpact": "HIGH",
"baseSeverity": "HIGH",
"baseScore": 7.8,
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
}
}
],
"source": {
"discovery": "UNKNOWN"
},
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"adp": [
{
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"timestamp": "2026-05-06T00:00:00+00:00",
"options": [
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"Exploitation": "none"
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"Automatable": "no"
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"Technical Impact": "total"
}
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"role": "CISA Coordinator",
"version": "2.0.3",
"id": "CVE-2026-6691"
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"title": "CISA ADP Vulnrichment",
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"dateUpdated": "2026-05-07T03:55:47.410Z"
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}
}