CVE-2026-76456
Full vulnerability record from the local CVENow database.
Description
As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco NX-OS engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening release that addresses multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-76456 are related to improper input validation of special elements used in a command issue that are grouped under the Common Weakness Enumeration (CWE) CWE-20.
Severity
HIGH
CVSS score
8.6
(v3.1)
Vulnerability status
Awaiting Analysis
Source identifier
Published
2026-10-07 17:16:57.770000
Last modified
2026-11-07 18:17:23.740000
View original CVE JSON
{
"id": "CVE-2026-76456",
"sourceIdentifier": "[email protected]",
"published": "2026-10-07T17:16:57.770",
"lastModified": "2026-11-07T18:17:23.740",
"vulnStatus": "Awaiting Analysis",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco NX-OS engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening release that addresses multiple internally discovered vulnerabilities.\r\n\r\nThe vulnerabilities tracked by CVE-2026-76456 are related to improper input validation of special elements used in a command issue that are grouped under the Common Weakness Enumeration (CWE) CWE-20."
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
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"version": "4.3(2f)",
"status": "affected"
},
{
"version": "4.2(3m)",
"status": "affected"
},
{
"version": "4.3(5a)",
"status": "affected"
},
{
"version": "4.3(4e)",
"status": "affected"
},
{
"version": "4.1(3n)",
"status": "affected"
},
{
"version": "4.3(4f)",
"status": "affected"
},
{
"version": "4.2(3n)",
"status": "affected"
},
{
"version": "4.3(5c)",
"status": "affected"
},
{
"version": "4.2(3o)",
"status": "affected"
},
{
"version": "4.3(5d)",
"status": "affected"
},
{
"version": "4.3(6a)",
"status": "affected"
},
{
"version": "4.3(6b)",
"status": "affected"
},
{
"version": "4.3(5e)",
"status": "affected"
},
{
"version": "4.3(6c)",
"status": "affected"
},
{
"version": "6.0(1b)",
"status": "affected"
},
{
"version": "4.2(3p)",
"status": "affected"
},
{
"version": "6.0(1c)",
"status": "affected"
},
{
"version": "4.3(6d)",
"status": "affected"
},
{
"version": "6.0(1d)",
"status": "affected"
},
{
"version": "6.0(1e)",
"status": "affected"
},
{
"version": "4.3(6e)",
"status": "affected"
},
{
"version": "6.0(1f)",
"status": "affected"
},
{
"version": "4.3(6f)",
"status": "affected"
},
{
"version": "6.0(2b)",
"status": "affected"
},
{
"version": "6.0(1h)",
"status": "affected"
},
{
"version": "4.2(3r)",
"status": "affected"
},
{
"version": "6.0(2c)",
"status": "affected"
},
{
"version": "4.3(6g)",
"status": "affected"
},
{
"version": "6.0(2d)",
"status": "affected"
},
{
"version": "4.3(6h)",
"status": "affected"
},
{
"version": "4.2(3s)",
"status": "affected"
},
{
"version": "4.3(6i)",
"status": "affected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "[email protected]",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
"baseScore": 8.6,
"baseSeverity": "HIGH",
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"scope": "CHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 3.9,
"impactScore": 4.0
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-10-07T18:02:41.724889Z",
"id": "CVE-2026-76456",
"options": [
{
"exploitation": "none"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Secondary",
"description": [
{
"lang": "en",
"value": "CWE-20"
}
]
}
],
"references": [
{
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-nxosw1-cWzSbtR",
"source": "[email protected]"
},
{
"url": "https://www.cve.org/Media/News/item/blog/2026/06/16/Preserving-Vulnerability-Level-Identification",
"source": "af854a3a-2127-422b-91ae-364da2661108"
}
]
}