---
id: "CVE-2026-115680"
kind: "vulnerability"
aliases: ["CVE-2026-115680"]
title: "Arm Keil MDK-Middleware: DHCPv6 option parsing over-reads and retransmits data"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["arm-keil", "dhcpv6", "embedded", "infrastructure", "mdk-middleware"]
not_affected_if: ["dhcpv6-not-used"]
published_at: "2026-10-26T16:17:17+00:00"
first_seen_at: "2026-10-26T16:31:01+00:00"
updated_at: "2026-10-26T16:33:12+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-115680", "first_seen_at": "2026-10-26T16:31:01+00:00"}]
---

# Arm Keil MDK-Middleware: DHCPv6 option parsing over-reads and retransmits data

Arm Keil MDK-Middleware 8.0.0 through 8.3.0 may mishandle DHCPv6 options, reading past buffer bounds and retransmitting unintended data. The sources do not state the exact impact beyond information disclosure of memory contents.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed MDK-Middleware version in the Keil MDK pack manager, and see whether it falls in `8.0.0` to `8.3.0`.
- Confirm whether the project enables the DHCPv6 client stack from MDK-Middleware (Network component).

## Fix

- Move MDK-Middleware to a version newer than `8.3.0` once Arm publishes a fixed release (unknown from sources).

## Timeline

- 2026-10-26T16:31:01+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-115680

## From the sources

Arm Keil MDK-Middleware 8.0.0-8.3.0 may allow DHCPv6 Option-Walk Over-Reads and Unintended Data Retransmission

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_