CVE-2026-76456: Improper Input Validation in Cisco Cisco NX-OS Software
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.
CVSS v3.1
Score 8.6high
Affected software
Cisco
Cisco NX-OS Software
Cisco
Cisco NX-OS System Software in ACI Mode
Cisco
Cisco Unified Computing System (Managed)
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Cisco NX-OS Software contains a vulnerability (CVE-2026-76456) due to improper input validation of special elements used in command issuance. This issue was discovered internally by Cisco's engineering team and is classified under CWE-20. The vulnerability has a CVSS 3.1 base score of 8.6, indicating high severity, with network attack vector, low attack complexity, no privileges or user interaction required, and a scope change. The impact is limited to availability, causing potential denial of service without affecting confidentiality or integrity.
Potential Impact
The vulnerability can lead to denial of service (availability impact) on affected Cisco NX-OS devices. There is no impact on confidentiality or integrity. No known exploits are reported in the wild at this time.
Mitigation Recommendations
No explicit patch or remediation details are provided in the available information. Patch status is not yet confirmed — check Cisco's official advisory for current remediation guidance. Since this was addressed in a software hardening release, applying the latest Cisco NX-OS software updates when available is recommended.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- cisco
- Date Reserved
- 2026-08-19T12:02:03.637Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ac674882cdf04f65664732a
Added to database: 10/07/2026, 16:34:16 UTC
Last enriched: 10/07/2026, 16:51:34 UTC
Last updated: 10/07/2026, 18:56:10 UTC
Views: 10
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