Intel

CVE-2026-76465

Nexus: Free of Memory not on the Heap (CVE-2026-76465)

criticalEPSS 0.4%

Description

A vulnerability in the MPLS Operation, Administration, and Maintenance (OAM) feature of Cisco NX-OS Software for Cisco Nexus 3000 Series Switches and Cisco Nexus 9000 Series Switches could allow an unauthenticated, remote attacker to execute arbitrary code with root privileges or cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper validation when an affected device is processing an MPLS echo-request packet. An attacker could exploit this vulnerability by sending a crafted MPLS echo-request to an IP address on an affected device. A successful exploit could allow the attacker to execute arbitrary code with root privileges and could cause process crashes, which could result in a device reload and a DoS condition.

Source: NVD (NIST)cvelistv5cisco_csafCVE.org (MITRE)BSI CSAFBSI WID Portal

Affected products

The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

CiscoNexus
3000 Series Switches9000 Series Switches9000 Series Fabric Switches <16.0(9h)9000 Series Fabric Switches <16.1(6g)9000 Series Fabric Switches <16.2(3g)
CiscoNX-OS
9108 100G Fabric Interconnects <4.3(6.260049)9108 100G Fabric Interconnects <4.3(6.260059)9108 100G Fabric Interconnects <4.3(6j)9108 100G Fabric Interconnects <6.0(2.260080)9108 100G Fabric Interconnects <6.0(2e)MDS 9000 Series Multilayer Switches <9.4(5a)Nexus 3000 Series Switches <10.3(10)Nexus 3000 Series Switches <10.4(8)Nexus 3000 Series Switches <10.5(6)Nexus 3000 Series Switches <10.6(4)Nexus 7000 Series Switches <8.4(14)Nexus 9000 Series Fabric Switches <16.0(9h)Nexus 9000 Series Fabric Switches <16.1(6g)Nexus 9000 Series Fabric Switches <16.2(3g)Nexus 9000 Series Switches <10.3(10)Nexus 9000 Series Switches <10.4(8)Nexus 9000 Series Switches <10.5(6)Nexus 9000 Series Switches <10.6(4)UCS 6300, 6400, 6500, and 6600 Series <4.3(6.260049)UCS 6300, 6400, 6500, and 6600 Series <4.3(6.260059)UCS 6300, 6400, 6500, and 6600 Series <4.3(6j)UCS 6300, 6400, 6500, and 6600 Series <6.0(2.260080)UCS 6300, 6400, 6500, and 6600 Series <6.0(2e)UCS 6300 Series Fabric Interconnect <4.3(6.260049)UCS 6300 Series Fabric Interconnect <4.3(6j)

Metrics

XIEM Effective CVSS
9.8
Source: nvd-v3
EPSS percentile
37.0 %
High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
KEV status
—
Show all metrics
Severity
critical
Priority score
89.96
Exploit maturity
no public PoC known
CVSS v3
9.8
EPSS score
0.4 %
Low — model estimates < 1% exploitation likelihood.
Published
2026-10-07 17:16 UTC
CWE
CWE-590

Weakness classes (CWE)

  • CWE-590Variant

    Free of Memory not on the Heap

    The product calls free() on a pointer to memory that was not allocated using associated heap allocation functions such as malloc(), calloc(), or realloc().

    cwe.mitre.org →

References & sources

Reanalysis & status changes

Chronological NVD audit events for this CVE — reanalyses, CVSS updates, CPE diffs.

  1. CVE Modified2026-10-08 04:17 UTC· 134c704f-9b21-4f2e-91b3-4a467353bcc0
    • SSVC: {"id":"CVE-2026-76465","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"yes"},{"technical…
    • SSVC: {"id":"CVE-2026-76465","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"yes"},{"technical…
  2. CVE Modified2026-10-07 18:17 UTC· 134c704f-9b21-4f2e-91b3-4a467353bcc0
    • SSVC: {"id":"CVE-2026-76465","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"yes"},{"technical…
  3. New CVE Received2026-10-07 17:16 UTC· psirt@cisco.com
    • Description: A vulnerability in the MPLS Operation, Administration, and Maintenance (OAM) feature of Cisco NX-OS Software for Cisco Nexus 3000 Series Switches and Cisco Nexus 9000 Series Switches could allow an unauthenticated, remote attacker to execute arbitrary code with&nbsp;root privileges or cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper validation when an affected device is processing an MPLS echo-request packet. An attacker could exploit this vulnerability by sending a crafted MPLS echo-request to an IP address on an affected device. A successful exploit could allow the attacker to execute arbitrary code with&nbsp;root privileges and could cause process crashes, which could result in a device reload and a DoS condition.
    • CVSS V3.1: AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    • CWE: CWE-590
    • Affected: New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/76xxx/CVE-2026-76465.json">CVE-2026-76465</a>

Linked advisories