CVE-2026-76456
Cisco NX-OS Software Security Hardening Release: October 2026 - Improper Input Validation Vulnerabilities
HIGH 8.6
At a glance
- Source
- NVD
- EPSS
- EPSS 0.28 % · percentile 20 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- cisco
- NVD status
- Awaiting Analysis
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-2026-76456 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.
Weaknesses (CWE)
- CWE-20 — Improper Input Validation
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 8.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H | cisco |
| CVSS 3.1 | HIGH 8.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H | NVD · psirt@cisco.com (Secondary) |
European references
- ENISA EUVD · EUVD-2026-94458
- GCVE · GCVE-0-2026-76456
CERT-FR advisories
- CERTFR-2026-AVI-1282 — Multiples vulnérabilités dans les produits Cisco · cert.ssi.gouv.fr
Affected products
| Product | Versions |
|---|---|
| Cisco · Cisco NX-OS Software | affected 8.2(5) ; affected 7.3(5)D1(1) ; affected 8.4(2) ; affected 8.4(3) ; affected 9.2(3) ; affected 8.2(1) |
| Cisco · Cisco NX-OS System Software in ACI Mode | affected 15.2(1g) ; affected 15.2(2e) ; affected 15.2(2f) ; affected 15.2(2g) ; affected 15.2(2h) ; affected 15.2(3f) |
| Cisco · Cisco Unified Computing System (Managed) | affected 4.0(1a) ; affected 4.1(1a) ; affected 4.1(1b) ; affected 4.0(4h) ; affected 4.1(1c) ; affected 4.0(4e) |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |