CVE-2026-67873CWE-122

CVE-2026-67873

Critical · published August 6, 2026

CVSS v3.1
9.8
EPSS
1%
Percentile
53.6
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00726 · 53.6th percentile
Weakness
CWE-122 · Heap-based Buffer Overflow
Published
2026-08-06T04:16Z
References (5)
https://github.com/mz-automation/lib60870 · [email protected]https://github.com/mz-automation/lib60870/blob/master/user_guide.adoc · [email protected]https://github.com/mz-automation/lib60870/issues/201 · [email protected]https://github.com/mz-automation/lib60870/releases/tag/v2.4.0 · [email protected]https://github.com/mz-automation/lib60870/issues/201 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 05 AUG 00:00Z
    A heap-based buffer overflow exists in lib60870-C 2.4.0 in the server-side FileSegment ASDU encoding path
    cvelistv5