CVE-2026-76459: Out-of-bounds Write in Cisco Cisco NX-OS Software

Cisco NX-OS Software contains multiple out-of-bounds write vulnerabilities grouped under CWE-787, identified through an internal security review. These vulnerabilities allow an attacker with low privileges and no user interaction to potentially cause high impact on confidentiality, integrity, and availability of the system. The issue is tracked as CVE-2026-76459 with a CVSS 3.1 score of 8.8. Cisco has released a software hardening update addressing these vulnerabilities, although explicit patch or affected version details are not provided in the input data.

The vulnerability allows an attacker with network access and low privileges to execute out-of-bounds write operations, potentially leading to complete compromise of confidentiality, integrity, and availability of the affected Cisco NX-OS system. This could result in unauthorized data access, system manipulation, or denial of service conditions.

Cisco has released a software hardening update that addresses these vulnerabilities. Users should apply the official Cisco NX-OS software updates as provided by Cisco. Patch status is not explicitly confirmed in the input data; therefore, users should consult Cisco's official advisories for the latest remediation guidance.