Unauthenticated root code execution via malformed NGOAM traffic
Published Oct 7, 2026 · Updated Oct 7, 2026
Improper packet validation in Cisco NX-OS Software NGOAM allows remote attackers to execute code as root or reload switches via crafted IP traffic. When SRv6 and NGOAM are enabled, the SRv6 OAM packet handler inadequately validates incoming IP traffic; the exact malformed field and parsing step have not been publicly identified. Traffic must reach an IP interface on an affected switch, where exploitation can also crash processes and trigger a device reload.
Summary
What happened
Improper packet validation in Cisco NX-OS Software NGOAM allows remote attackers to execute code as root or reload switches via crafted IP traffic. When SRv6 and NGOAM are enabled, the SRv6 OAM packet handler inadequately validates incoming IP traffic; the exact malformed field and parsing step have not been publicly identified. Traffic must reach an IP interface on an affected switch, where exploitation can also crash processes and trigger a device reload.
The record
- CVE
- CVE-2026-76501
- Published
- Oct 7, 2026
- Updated
- Oct 7, 2026
- Vendor
- Clam AntiVirus
- Product
- Cisco NX-OS Software
- Classifications
- T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Oct 7, 2026CVE publishedPublication date reported by the CVE source.
- Oct 7, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=10.3(1)
- Affected versionversion=10.3(2)
- Affected versionversion=10.3(3)
- Affected versionversion=10.3(3o)
- Affected versionversion=10.3(3p)
- Affected versionversion=10.3(3q)
- Affected versionversion=10.3(3r)
- Affected versionversion=10.3(3w)
- Affected versionversion=10.3(3x)
- Affected versionversion=10.3(4)
- Affected versionversion=10.3(4a)
- Affected versionversion=10.3(4g)
- Affected versionversion=10.3(4h)
- Affected versionversion=10.3(5)
- Affected versionversion=10.3(6)
- Affected versionversion=10.3(7)
- Affected versionversion=10.3(8)
- Affected versionversion=10.3(9)
- Affected versionversion=10.3(99w)
- Affected versionversion=10.3(99x)
- Affected versionversion=10.4(1)
- Affected versionversion=10.4(2)
- Affected versionversion=10.4(3)
- Affected versionversion=10.4(4)
- Affected versionversion=10.4(4g)
- Affected versionversion=10.4(5)
- Affected versionversion=10.4(6)
- Affected versionversion=10.4(7)
- Affected versionversion=10.5(1)
- Affected versionversion=10.5(2)
- Affected versionversion=10.5(3)
- Affected versionversion=10.5(3e)
- Affected versionversion=10.5(3o)
- Affected versionversion=10.5(3p)
- Affected versionversion=10.5(3s)
- Affected versionversion=10.5(3t)
- Affected versionversion=10.5(4)
- Affected versionversion=10.5(5)
- Affected versionversion=10.6(1)
- Affected versionversion=10.6(1s)
- Affected versionversion=10.6(2)
- Affected versionversion=10.6(2n)
- Affected versionversion=10.6(2s)
- Affected versionversion=10.6(3)
- Affected versionversion=10.6(3s)
- Affected versionversion=9.3(10)
- Affected versionversion=9.3(11)
- Affected versionversion=9.3(12)
- Affected versionversion=9.3(13)
- Affected versionversion=9.3(14)
- Affected versionversion=9.3(15)
- Affected versionversion=9.3(16)
- Affected versionversion=9.3(17)
- Affected versionversion=9.3(3)
- Affected versionversion=9.3(4)
- Affected versionversion=9.3(5)
- Affected versionversion=9.3(5w)
- Affected versionversion=9.3(6)
- Affected versionversion=9.3(7)
- Affected versionversion=9.3(7a)
- Affected versionversion=9.3(7k)
- Affected versionversion=9.3(8)
- Affected versionversion=9.3(9)
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Activity data is delayed. The latest report is Sep 28, 2026.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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