Cisco NX-OS up to 10.6(3s) NGOAM input validation

Summaryinfo

A vulnerability identified as very critical has been detected in Cisco NX-OS. This affects an unknown part of the component NGOAM. The manipulation leads to input validation. This vulnerability is traded as CVE-2026-76501. It is possible to initiate the attack remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as very critical, has been found in Cisco NX-OS. This issue affects some unknown functionality of the component NGOAM. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at sec.cloudapps.cisco.com. The identification of this vulnerability is CVE-2026-76501 since 08/19/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 10/07/2026).

Upgrading eliminates this vulnerability.

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Productinfo

Type

• Router Operating System

Vendor

• Cisco

Name

• NX-OS

Version

• 9.3(3)
• 9.3(4)
• 9.3(5)
• 9.3(5w)
• 9.3(6)
• 9.3(7)
• 9.3(7a)
• 9.3(7k)
• 9.3(8)
• 9.3(9)
• 9.3(10)
• 9.3(11)
• 9.3(12)
• 9.3(13)
• 9.3(14)
• 9.3(15)
• 9.3(16)
• 9.3(17)
• 10.3(1)
• 10.3(2)
• 10.3(3)
• 10.3(3o)
• 10.3(3p)
• 10.3(3q)
• 10.3(3r)
• 10.3(3w)
• 10.3(3x)
• 10.3(4)
• 10.3(4a)
• 10.3(4g)
• 10.3(4h)
• 10.3(5)
• 10.3(6)
• 10.3(7)
• 10.3(8)
• 10.3(9)
• 10.3(99w)
• 10.3(99x)
• 10.4(1)
• 10.4(2)
• 10.4(3)
• 10.4(4)
• 10.4(4g)
• 10.4(5)
• 10.4(6)
• 10.4(7)
• 10.5(1)
• 10.5(2)
• 10.5(3)
• 10.5(3e)
• 10.5(3o)
• 10.5(3p)
• 10.5(3s)
• 10.5(3t)
• 10.5(4)
• 10.5(5)
• 10.6(1)
• 10.6(1s)
• 10.6(2)
• 10.6(2n)
• 10.6(2s)
• 10.6(3)
• 10.6(3s)

License

• commercial

Website

• Vendor: https://www.cisco.com/

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