CVE-2026-44859: Arubanetworks ArubaOS Buffer Overflow Flaw

CVE-2026-44859 Overview

CVE-2026-44859 is a stack-based buffer overflow vulnerability affecting several underlying management service components in Aruba Networks AOS-8 and AOS-10 operating systems. The flaw resides in services accessed through the command-line interface (CLI). An authenticated attacker holding administrative privileges can send specially crafted requests to the affected services and trigger memory corruption. Successful exploitation allows arbitrary code execution with elevated privileges on the underlying operating system, breaking out of the constrained CLI environment.

Critical Impact

Authenticated administrators can execute arbitrary code with elevated privileges on the underlying OS of AOS-8 and AOS-10 devices, bypassing CLI restrictions and gaining full control of network infrastructure.

Affected Products

• Aruba Networks ArubaOS (AOS-8 and AOS-10)
• Aruba Networks SD-WAN
• HPE Aruba Networking management service components reachable through the CLI

Discovery Timeline

• 2026-05-12 - CVE-2026-44859 published to NVD
• 2026-05-14 - Last updated in NVD database

Technical Details for CVE-2026-44859

Vulnerability Analysis

The vulnerability is classified as a stack-based buffer overflow [CWE-121]. It exists in multiple management service components that ArubaOS exposes through the CLI on AOS-8 and AOS-10. When an authenticated administrator issues crafted commands or arguments, the affected components copy user-controlled input into fixed-size stack buffers without enforcing proper length validation. Overwriting the saved return address or adjacent stack data leads to control-flow hijacking. Because the affected services run with elevated privileges on the underlying Linux-based operating system, exploitation results in code execution outside the restricted CLI shell.

Root Cause

The root cause is missing or insufficient bounds checking on input handled by privileged CLI-adjacent management daemons. The components accept variable-length argument data but allocate fixed-size stack buffers to hold that data. Inputs exceeding the expected length overflow the buffer and corrupt stack metadata, including saved registers and return addresses.

Attack Vector

An attacker must authenticate to the device with administrative credentials before exploitation. The attacker then issues specially crafted requests to the vulnerable CLI-accessible services. The attack vector is network-reachable in environments where the CLI is exposed over SSH or in-band management. Exploitation converts administrative CLI access into arbitrary code execution on the host OS, which can be used to install persistence, pivot deeper into the network, or tamper with switching and routing functions.

No verified public exploit code is available for CVE-2026-44859 at the time of writing. See the HPE Security Bulletin for vendor-confirmed technical details and affected version ranges.

Detection Methods for CVE-2026-44859

Indicators of Compromise

• Unexpected process crashes or core dumps generated by ArubaOS management daemons following CLI sessions.
• CLI session activity from administrative accounts that includes unusually long argument strings or non-printable characters.
• New or unexpected processes spawned under the privilege context of management services after CLI interaction.
• Outbound network connections originating from the controller or gateway to unfamiliar destinations following an admin login.

Detection Strategies

• Audit AOS-8 and AOS-10 logs for repeated authentication from administrative accounts followed by abnormal CLI command patterns.
• Correlate SSH login events with subsequent service restarts or crash logs on the device.
• Monitor TACACS+ and RADIUS accounting records for administrative sessions originating from unexpected source addresses.

Monitoring Recommendations

• Forward ArubaOS syslog and crash data to a centralized analytics platform for retention and correlation.
• Alert on administrative logins outside of approved change windows or from non-jump-host source IPs.
• Track configuration changes and management-plane command history for deviations from documented baselines.

How to Mitigate CVE-2026-44859

Immediate Actions Required

• Apply the fixed AOS-8 and AOS-10 software versions listed in the HPE security bulletin to all affected controllers, gateways, and SD-WAN devices.
• Restrict CLI and management-plane access to a dedicated out-of-band management network or jump hosts.
• Rotate administrative credentials and audit all privileged accounts on affected devices.
• Review logs for evidence of suspicious administrative activity prior to patching.

Patch Information

HPE has published fixed software releases for the affected AOS-8 and AOS-10 branches. Refer to the HPE Security Bulletin hpesbnw05048en_us for the complete list of fixed versions and upgrade guidance. Upgrade all controllers, mobility conductors, gateways, and SD-WAN appliances to the vendor-specified remediated builds.

Workarounds

• Limit CLI access to a minimal set of trusted administrators and source networks using access control lists.
• Enforce multi-factor authentication on TACACS+ or RADIUS-backed administrative logins to raise the bar for credential abuse.
• Disable unused management interfaces and protocols on affected devices until patches are deployed.

# Configuration example: restrict management access to a trusted subnet
mgmt-user ssh-pubkey-auth
ip access-list standard mgmt-acl
  permit 10.10.0.0 0.0.0.255
  deny any
control-plane-security
  cpsec-enable
management access-list apply mgmt-acl