Vulnerability · Published Oct 7, 2026 · Assigned by cisco
CVE-2026-76471Cisco NX-OS Software NX-API Remote Code Execution Vulnerability
Critical 9.8
In plain English
A critical-severity heap buffer overflow in Cisco NX-OS Software from Cisco. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 42% of all known vulnerabilities).
Official description
A vulnerability in the NX-API feature of Cisco NX-OS Software could allow an unauthenticated, remote attacker to execute arbitrary code with root privileges or cause a denial of service (DoS) condition on an affected device. The vulnerability is due to insufficient input validation of data that is sent to the NX-API. An attacker could exploit this vulnerability by sending a crafted HTTP request to the NX-API of an affected device. A successful exploit could allow the attacker to execute arbitrary code with root privileges and could cause process crashes, which could result in a reload of the device and a DoS condition.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Cisco | Cisco NX-OS Software | 9.2(3)9.2(2v)9.2(1)9.2(2t)9.2(3y)9.3(2)9.2(4)9.3(1) |
| Cisco | Cisco Unified Computing System (Managed) | 4.0(1a)4.1(1d)4.0(4f)4.0(4a)4.0(4e)4.0(4c)4.0(4h)4.1(1c) |
Weakness: CWE-122 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H