CVE-2026-76501
CriticalCVSS 9.8Summary
Vulnerability in SRv6 OAM (NGOAM) feature of Cisco NX-OS allows unauthenticated remote attacker to execute arbitrary code with root privileges or cause DoS. Due to improper input validation when NGOAM and SRv6 features are enabled.
Risk Assessment
An attacker could gain control of the device or cause it to reload, leading to network disruption.
Recommendation
Apply the Cisco NX-OS software update that includes the fix, and consider disabling NGOAM features if not needed.
Other vulnerabilities in Cisco NX-OS Software
See all- CVE-2026-20173Medium
A vulnerability in Cisco NX-OS Software could allow an unauthenticated, remote attacker to exhaust system resources, causing a denial of service (DoS) condition. The issue exists because rate limiting was improperly applied to some protocols. An attacker could exploit this by sending a high rate of UDP or TCP connections to a data plane interface, leading to instability in routing and control plane protocols.
- CVE-2026-20032Medium
A vulnerability in the Python interpreter of Cisco NX-OS Software could allow an authenticated, local attacker with low privileges to escape the Python sandbox and gain unauthorized access to the underlying operating system. The issue is due to insufficient validation of user-supplied input. An attacker could manipulate specific functions within the Python interpreter to execute arbitrary commands on the operating system with the privileges of the authenticated user.
- CVE-2026-76486Critical
Vulnerability in VXLAN OAM (NGOAM) feature of Cisco NX-OS allows unauthenticated remote attacker to execute arbitrary code with root privileges or cause DoS. Due to improper input validation when NGOAM is enabled.
- CVE-2026-76485Critical
Vulnerability in VXLAN OAM (NGOAM) feature of Cisco NX-OS allows unauthenticated remote attacker to execute arbitrary code with root privileges or cause DoS. Due to improper input validation when NGOAM is enabled.
- CVE-2026-76471Critical
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 DoS condition. It is due to insufficient input validation of data sent to the NX-API.
- CVE-2026-76465Critical
A vulnerability in the MPLS OAM feature of Cisco NX-OS Software for Nexus 3000 and 9000 Series Switches could allow an unauthenticated, remote attacker to execute arbitrary code with root privileges or cause a DoS condition. It is due to improper validation of MPLS echo-request packets.
- CVE-2026-76455Critical
The Cisco NX-OS team discovered vulnerabilities related to improper access control (CWE-284) during an internal security review. They were addressed in a hardening release.
Original NVD description (English source)
A vulnerability in the Segment Routing over IPv6 (SRv6) Operation, Administration, and Maintenance (OAM) feature of Cisco NX-OS Software, known as NGOAM, could allow an unauthenticated, remote attacker to execute arbitrary code with root privileges or cause a denial of service (DoS) on an affected device. This vulnerability is due to improper input validation of IP traffic when the NGOAM and SRv6 features are enabled. An attacker could exploit this vulnerability by sending crafted packets to an IP interface on an affected device. A successful exploit could allow the attacker to execute arbitrary code with root privileges and could cause process crashes resulting in a reload and DoS condition.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS