CVE-2026-76459

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-2026-76459 are related to out-of-bounds write issues that are grouped under the Common Weakness Enumeration (CWE) CWE-787.

CVSS v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-nxosw1-cWzSbtR

Configurations

No configuration.

History

09 Oct 2026, 14:17

Type	Values Removed	Values Added
CVSS	v2 : ~~unknown~~ v3 : ~~8.8~~	v2 : unknown v3 : 9.8

07 Oct 2026, 17:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-07 17:16

Updated : 2026-10-09 14:17

NVD link : CVE-2026-76459

Mitre link : CVE-2026-76459

CVE.ORG link : CVE-2026-76459

JSON object : View

Products Affected

No product.

CWE

CWE-787

Out-of-bounds Write

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"affected", "version": "4.2(3k)"}, {"status": "affected", "version": "4.3(4b)"}, {"status": "affected", "version": "4.3(4c)"}, {"status": "affected", "version": "4.2(3l)"}, {"status": "affected", "version": "4.3(4d)"}, {"status": "affected", "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": "4.2(3p)"}, {"status": "affected", "version": "6.0(1b)"}, {"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"}]}], "published": "2026-10-07T17:16:58.553", "references": [{"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-nxosw1-cWzSbtR", "source": "psirt@cisco.com"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "psirt@cisco.com", "description": [{"lang": "en", "value": "CWE-787"}]}], "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-2026-76459 are related to out-of-bounds write issues that are grouped under the Common Weakness Enumeration (CWE) CWE-787."}], "lastModified": "2026-10-09T14:17:22.427", "sourceIdentifier": "psirt@cisco.com"}