Improper input validation in Cisco Nx-Os Software
CVE-2026-76456
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.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Cisco Nx-Os Software — versions 10.3(1), 10.3(2), 10.3(3)
- Cisco Nx-Os System Software In Aci Mode — versions 15.2(1g), 15.2(2e), 15.2(2f)
- Cisco Unified Computing System (Managed) — versions 4.0(1a), 4.0(1b), 4.0(1c)
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-76456?
- CVE-2026-76456 is a high-severity vulnerability in Cisco Nx-Os Software, classified under Improper Input Validation. CVSS score: 8.6/10. Published 2026-10-07.
- How severe is CVE-2026-76456?
- High severity. CVSS v3 base score is 8.6 out of 10.