CVE-2026-76459 Cisco NX-OS - Out-of-Bounds Write

Cisco NX-OS contains out-of-bounds write vulnerabilities caused by improper bounds checking, letting attackers potentially corrupt memory or cause denial of service, exploit requires network access.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.31% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Out-of-Bounds Write
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
7 October 2026
Updated
15 October 2026
Weakness
CWE-787

Vendor fix

Update to the latest Cisco NX-OS software version with security hardening.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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