CVE-2026-35084: dali-devconfig Buffer Overflow Flaw

CVE-2026-35084 Overview

CVE-2026-35084 is a stack buffer overflow vulnerability [CWE-121] in the dali-devconfig utility. A remote attacker holding low-privilege user credentials can exploit the flaw to gain full system access as root. The issue is tracked by CERT-VDE under advisory VDE-2026-039 and carries a CVSS 4.0 base score of 8.7.

The vulnerability allows network-based exploitation with low attack complexity and requires only standard user privileges. Successful exploitation results in complete compromise of confidentiality, integrity, and availability on the affected device.

Critical Impact

Authenticated remote attackers can trigger a stack buffer overflow in dali-devconfig to achieve arbitrary code execution as root, resulting in full system takeover.

Affected Products

• Products referenced in CERT-VDE advisory VDE-2026-039 that ship the dali-devconfig component
• Devices exposing the DALI device configuration interface to authenticated users
• See the CERT-VDE Security Advisory for the authoritative affected-product list

Discovery Timeline

• 2026-06-03 - CVE-2026-35084 published to NVD
• 2026-06-03 - Last updated in NVD database

Technical Details for CVE-2026-35084

Vulnerability Analysis

The vulnerability is a classic stack-based buffer overflow [CWE-121] in the dali-devconfig utility. The component accepts input from authenticated network users and copies it into a fixed-size stack buffer without enforcing length boundaries. When attacker-controlled input exceeds the buffer capacity, adjacent stack memory is overwritten, including saved frame pointers and return addresses.

Because dali-devconfig executes with elevated privileges, successful exploitation provides code execution in the context of root. This converts a low-privilege foothold into full administrative control of the device.

The attack is remotely reachable. An authenticated user account is the only prerequisite, and no user interaction is required. Refer to the CERT-VDE Security Advisory for vendor-confirmed technical specifics.

Root Cause

The root cause is missing bounds validation on attacker-controlled input before it is written to a stack-allocated buffer within dali-devconfig. Unsafe copy semantics permit the input length to exceed the destination size, corrupting control data on the stack.

Attack Vector

Exploitation follows a standard pattern. The attacker authenticates with valid low-privilege credentials, then submits an oversized payload to the vulnerable dali-devconfig interface over the network. The overflow overwrites the return address, redirecting execution to attacker-supplied instructions that run as root. No verified proof-of-concept code is publicly available at the time of publication.

Detection Methods for CVE-2026-35084

Indicators of Compromise

• Unexpected crashes, restarts, or core dumps of the dali-devconfig process on affected devices
• Abnormally large request payloads directed at the DALI device configuration interface
• New root-owned processes, shells, or outbound connections initiated shortly after authenticated sessions from low-privilege accounts

Detection Strategies

• Inspect network traffic to the device configuration service for oversized fields and malformed parameters
• Correlate authentication events for low-privilege accounts with subsequent privilege transitions to root
• Monitor process telemetry for anomalous child processes spawned by dali-devconfig

Monitoring Recommendations

• Forward device and application logs to a centralized SIEM and alert on dali-devconfig crash signatures
• Track failed and successful authentications to the DALI configuration endpoint and baseline normal request sizes
• Enable file integrity monitoring on system binaries and configuration files to detect post-exploitation tampering

How to Mitigate CVE-2026-35084

Immediate Actions Required

• Review the CERT-VDE Security Advisory and identify affected assets in your environment
• Restrict network access to the dali-devconfig interface to trusted management networks only
• Rotate credentials for any low-privilege accounts that can reach the affected service
• Apply vendor-supplied patches as soon as they are released for affected products

Patch Information

Consult the CERT-VDE Security Advisory VDE-2026-039 for vendor patch availability and remediation guidance. No fixed-version metadata is published in the NVD entry at the time of writing.

Workarounds

• Place affected devices behind a firewall and allow management access only from administrative jump hosts
• Disable or block the dali-devconfig service if it is not required for operations
• Enforce strong authentication and the principle of least privilege on all accounts that can reach the device