CVE-2026-44858: Arubanetworks ArubaOS Buffer Overflow Flaw

CVE-2026-44858 Overview

CVE-2026-44858 is a stack-based buffer overflow vulnerability [CWE-121] affecting Aruba Networks AOS-8 and AOS-10 operating systems. The flaw resides in multiple underlying management service components reachable 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 the boundary between administrative CLI access and full OS-level control on Aruba SD-WAN gateways and controllers.

Critical Impact

Authenticated administrators can escape the CLI sandbox and execute arbitrary code with elevated privileges on the underlying AOS operating system.

Affected Products

• Aruba Networks ArubaOS (AOS-8 and AOS-10)
• Aruba Networks SD-WAN
• Mobility Controllers and Gateways running affected AOS versions

Discovery Timeline

• 2026-05-12 - CVE-2026-44858 published to NVD
• 2026-05-14 - Last updated in NVD database

Technical Details for CVE-2026-44858

Vulnerability Analysis

The vulnerability exists in several management service components that parse input received from the AOS CLI. These services fail to enforce proper bounds checking on user-supplied data before copying it into fixed-size stack buffers. An administrator-authenticated session can submit crafted command arguments that exceed the expected buffer length and overwrite adjacent stack memory, including saved return addresses and frame pointers.

Because the affected services run with elevated privileges on the underlying Linux-based operating system, successful corruption of the stack frame yields code execution outside the CLI restricted shell. This effectively converts administrative CLI access into full root-level control on AOS-8 and AOS-10 platforms, including Aruba SD-WAN gateways.

Root Cause

The root cause is improper validation of input length before performing stack memory writes within management service handlers invoked through the CLI. The pattern is consistent with classic [CWE-121] Stack-based Buffer Overflow, where unchecked strcpy-style or sprintf-style operations copy attacker-controlled strings into stack-allocated buffers.

Attack Vector

Exploitation requires the attacker to be authenticated with administrative privileges on the device. The attacker connects to the CLI over the network management interface and issues specially crafted commands or arguments targeting the vulnerable management service. No user interaction is required beyond the authenticated session. Refer to the HPE Security Bulletin for component-specific technical details.

Detection Methods for CVE-2026-44858

Indicators of Compromise

• Unexpected process crashes or core dumps from AOS management service binaries on controllers or gateways.
• New or unauthorized administrative sessions originating from unusual source IP addresses or at atypical times.
• Anomalous CLI command sequences containing unusually long argument strings to management subcommands.

Detection Strategies

• Audit AOS administrative login records and correlate session activity with CLI command history for outlier patterns.
• Monitor management service logs for repeated abnormal terminations or restarts of CLI-accessible daemons.
• Track configuration changes and privilege use following any administrative login from non-jump-host sources.

Monitoring Recommendations

• Forward AOS syslog and authentication events to a centralized SIEM and alert on administrative login anomalies.
• Enforce TACACS+ or RADIUS accounting to capture every CLI command issued by administrative users.
• Baseline normal CLI usage and alert when command argument lengths or shell escapes deviate from the baseline.

How to Mitigate CVE-2026-44858

Immediate Actions Required

• Apply the fixed AOS-8 and AOS-10 firmware versions referenced in the HPE Aruba security advisory as soon as maintenance windows permit.
• Restrict management plane access to a dedicated out-of-band network and a small set of authorized jump hosts.
• Rotate administrative credentials and review the list of accounts with administrative privileges on every affected device.

Patch Information

Hewlett Packard Enterprise has published remediation guidance and fixed firmware versions in the HPE Aruba Networking Security Advisory hpesbnw05048en_us. Upgrade affected AOS-8, AOS-10, and SD-WAN deployments to the patched releases listed in that advisory.

Workarounds

• Enable the cli-no-shell or equivalent restricted-shell enforcement options if supported by your AOS release to limit access to vulnerable subcommands.
• Limit administrative access by enforcing role-based access control so that only essential personnel retain full admin privileges.
• Place management interfaces behind ACLs that permit access only from trusted administrative subnets.

# Example: restrict AOS management access to a trusted subnet
configure terminal
mgmt-user access-list permit 10.10.0.0 255.255.0.0
mgmt-user access-list deny any
exit
write memory