---
id: "CVE-2026-68907"
kind: "vulnerability"
aliases: ["CVE-2026-68907"]
title: "libIEC61850: stack over-read in dataset handling lets remote crash servers"
severity: "high"
cvss: 8.2
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["energy", "iec-61850", "industrial-control", "libiec61850", "package", "scada", "substation"]
not_affected_if: ["client-only", "dynamic-dataset-disabled"]
published_at: "2026-10-16T16:20:00+00:00"
first_seen_at: "2026-10-23T21:57:13+00:00"
updated_at: "2026-10-25T03:04:29+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68907", "first_seen_at": "2026-10-23T21:57:13+00:00"}]
---

# libIEC61850: stack over-read in dataset handling lets remote crash servers

libIEC61850 is an open-source library implementing IEC 61850 client and server protocols. Before 1.6.2, a remote defineNamedVariableList request triggers a stack over-read that can crash the server and may corrupt caller stack memory.

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

## How to check

- Check the libIEC61850 version in use: `unknown` for exact command, look for the library version in your build or package manifest
- Confirm whether the server enables dynamic dataset service and installs a dataset access handler; the sources do not give a config key name

## Fix

- Upgrade libIEC61850 to `1.6.2` or later

## Timeline

- 2026-10-23T21:57:13+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-68907

## From the sources

libIEC61850 is an open-source implementation of IEC 61850 client and server protocols including MMS, GOOSE, Sampled Values, and R-Session. Prior to 1.6.2, checkDataSetAccess reverses the source and destination arguments to StringUtils_copyStringToBuffer while constructing an MMS_ASSOCIATION_SPECIFIC dataset reference. The helper treats uninitialized dataSetRef[130] storage as a source string, causing strlen to read beyond the stack buffer, and then copies those bytes into the caller-owned listName buffer. A remote defineNamedVariableList request can crash servers that have dynamic dataset service enabled and a dataset access handler installed; the advisory also observes caller stack corruption but establishes denial of service as the primary impact. This issue is fixed in version 1.6.2.

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