CVE-2026-76459

CRITICAL

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 s...

Affects 0 products across 1 vendor.

CVSS 3.19.8
EPSS0.3%
Percentile22th
PatchUnknown
CVSS Vector — Plain English Remotely exploitable over the network, low complexity, no authentication required, no user interaction needed, impact contained to the vulnerable component, full confidentiality impact, full integrity impact, full availability impact.
CWE Weakness Definitions
CWE-787: Out-of-Bounds Write

Software writes data past buffer boundaries, corrupting memory and potentially enabling code execution.

◆ AI Analysis — automated analysis, not human-reviewed

A critical severity vulnerability (CVE-2026-76459) affects the target system. 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 int...

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Frequently Asked Questions
What is CVE-2026-76459?
A critical severity vulnerability (CVE-2026-76459) affects the target system. 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 int...
What is the CVSS score for CVE-2026-76459?
CVE-2026-76459 has CVSS 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS: 0.3%.
Is CVE-2026-76459 actively exploited?
No confirmed active exploitation of CVE-2026-76459 as of 2026-10-11.
How do I remediate CVE-2026-76459?
Apply vendor patches for CVE-2026-76459. Monitor Cisco advisories.
What systems are affected by CVE-2026-76459?
CVE-2026-76459 affects: Cisco.
Vulnerability Details
CVE IDCVE-2026-76459
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published2026-10-07
Last Modified2026-10-09
ICS Relevance70%
Weakness (CWE)
Out-of-Bounds Write
SourceNVD
Official 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-2026-76459 are related to out-of-bounds write issues that are grouped under the Common Weakness Enumeration (CWE) CWE-787.

Source: NIST NVD / MITRE CVE Database

Affected Products
VendorProductAffected Versions
Cisco — —
Remediation

No patch URL on record. Monitor vendor security advisories directly.

Threat Intelligence
● Threat Intelligence Validated: October 2026 | Threat Age: 3 Days
CISA known-exploitedNot in KEV catalog
Public ExploitNot confirmed
PoC CodeNot confirmed
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