CVE-2026-76459CWE-787

CVE-2026-76459

Critical · published October 7, 2026

CVSS v3.1
9.8
EPSS
0%
Percentile
22.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00307 · 22.3th percentile
Weakness
CWE-787 · Out-of-bounds Write
Published
2026-10-07T21:16Z
References (1)
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-nxosw1-cWzSbtR · [email protected]
EPSS history
Timeline
  • 09 OCT 03:31Z
    EPSS moved — → 0%
    epss
  • 07 OCT 16:15Z
    Cisco NX-OS Software Security Hardening Release: October 2026 - Out-of-bounds Write Vulnerabilities
    cvelistv5