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Vulnerability record · CVE-2026-67873 · published 6 August 2026

CVE-2026-67873: Heap-based buffer overflow vulnerability

A heap-based buffer overflow exists in lib60870-C 2.4.0 in the server-side FileSegment ASDU encoding path. The issue occurs because FileSegment_encode() validates only the standalone segment length via FileSegment_GetMaxDataSize() and does not verify the residual capacity of the current ASDU frame before encoding object fields and segment data

9.8 CVSS 3.1 Critical EPSS 0.73% · top 47.8% CWE-122 · Heap-based buffer overflow Deferred
9.8CVSS 3.1 base score
0.73%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
31 Aug 2026Last modified by NVD

Description

A heap-based buffer overflow exists in lib60870-C 2.4.0 in the server-side FileSegment ASDU encoding path. The issue occurs because FileSegment_encode() validates only the standalone segment length via FileSegment_GetMaxDataSize() and does not verify the residual capacity of the current ASDU frame before encoding object fields and segment data

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

LinkTags
https://github.com/mz-automation/lib60870
https://github.com/mz-automation/lib60870/blob/master/user_guide.adoc
https://github.com/mz-automation/lib60870/issues/201
https://github.com/mz-automation/lib60870/releases/tag/v2.4.0
https://github.com/mz-automation/lib60870/issues/201

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Source: NIST National Vulnerability Database (record CVE-2026-67873), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.