---
id: CVE-2026-61893
title: |-
  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.
summary: |-
  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.
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L'
cwe:
  - CWE-125
published: '2026-07-30'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T19:30:43.093'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-61893'
references:
  - url: >-
      https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-211-11.json
    label: ics-cert@hq.dhs.gov
  - url: >-
      https://github.com/mz-automation/lib60870/security/advisories/GHSA-g3w7-x5rx-83xm
    label: ics-cert@hq.dhs.gov
  - url: 'https://www.cisa.gov/news-events/ics-advisories/icsa-26-211-11'
    label: ics-cert@hq.dhs.gov
  - url: >-
      https://github.com/mz-automation/lib60870/security/advisories/GHSA-g3w7-x5rx-83xm
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00403
epssPercentile: 0.34364
ingestedAt: '2026-09-08T20:10:03.155Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.