Buffer overflow in Cisco Nx-Os Software
CVE-2026-76501
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 class: Buffer Overflow
Published .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Cisco Nx-Os Software — versions 10.3(1), 10.3(2), 10.3(3)
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-76501?
- CVE-2026-76501 is a critical-severity vulnerability in Cisco Nx-Os Software, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2026-10-07.
- How severe is CVE-2026-76501?
- Critical severity. CVSS v3 base score is 9.8 out of 10.