{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-76456", "assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633", "state": "PUBLISHED", "assignerShortName": "cisco", "dateReserved": "2026-08-19T12:02:03.637Z", "datePublished": "2026-10-07T16:15:11.980Z", "dateUpdated": "2026-10-07T18:05:35.961Z"}, "containers": {"cna": {"title": "Cisco NX-OS Software Security Hardening Release: October 2026 - Improper Input Validation Vulnerabilities", "metrics": [{"format": "cvssV3_1", "cvssV3_1": {"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"}}], "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."}], "references": [{"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-nxosw1-cWzSbtR", "name": "cisco-sa-hardening-nxosw1-cWzSbtR"}], "exploits": [{"lang": "en", "value": "The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory."}], "source": {"advisory": "cisco-sa-hardening-nxosw1-cWzSbtR", "discovery": "INTERNAL", "defects": ["CSCwu49591"]}, "problemTypes": [{"descriptions": [{"lang": "en", "description": "Improper Input Validation", "type": "cwe", "cweId": "CWE-20"}]}], "affected": [{"vendor": "Cisco", "product": "Cisco NX-OS Software", 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{"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)"}], "defaultStatus": "unknown"}], "exploits": [{"lang": "en", "value": "The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory."}], "references": [{"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-nxosw1-cWzSbtR", "name": "cisco-sa-hardening-nxosw1-cWzSbtR"}], "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."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "cwe", "cweId": "CWE-20", "description": "Improper Input Validation"}]}], "providerMetadata": {"orgId": "d1c1063e-7a18-46af-9102-31f8928bc633", "shortName": "cisco", "dateUpdated": "2026-10-07T16:15:11.980Z"}}}, "cveMetadata": {"cveId": "CVE-2026-76456", "state": "PUBLISHED", "dateUpdated": "2026-10-07T18:05:35.961Z", "dateReserved": "2026-08-19T12:02:03.637Z", "assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633", "datePublished": "2026-10-07T16:15:11.980Z", "assignerShortName": "cisco"}, "dataVersion": "5.2"}

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"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."}], "id": "CVE-2026-76456", "lastModified": "2026-10-08T20:08:45.857", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.6, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 4.0, "source": "psirt@cisco.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-76456", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-07T18:02:41.724889Z", "version": "2.0.3"}}]}, "published": "2026-10-07T17:16:57.770", "references": [{"source": "psirt@cisco.com", "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-nxosw1-cWzSbtR"}], "sourceIdentifier": "psirt@cisco.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-20"}], "source": "psirt@cisco.com", "type": "Secondary"}]}

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