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CVE-2026-76501: Cisco Nexus 9000 Series Switches SRv6 OAM (NGOAM) Remote Code Execution Vulnerability
- Severity: critical (CVSS 9.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.5% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-10-07 · updated 2026-10-08
- Weakness: CWE-121
Description
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.
Affected products
- Cisco NX-OS: 9.3(3), 9.3(4), 9.3(5), 9.3(6), 9.3(5w), 9.3(7) (+57)
In the news
- Cisco Advance Notification for Publication of October 7, 2026, Security Advisories
- Cisco Nexus 3000 and 9000 Series Switches NGOAM Remote Code Execution Vulnerabilities
References
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