CVE-2026-67873: n/a
A heap-based buffer overflow vulnerability exists in lib60870-C version 2.4.0 within the server-side FileSegment ASDU encoding path. The flaw arises because the FileSegment_encode() function only validates the standalone segment length but does not check the remaining capacity of the current ASDU frame before encoding, potentially leading to memory corruption.
AI Analysis
Technical Summary
CVE-2026-67873 is a critical heap-based buffer overflow vulnerability in lib60870-C 2.4.0 affecting the server-side FileSegment ASDU encoding path. The vulnerability occurs because the FileSegment_encode() function validates the segment length using FileSegment_GetMaxDataSize() but fails to verify the residual capacity of the ASDU frame before encoding object fields and segment data. This can lead to a heap overflow, causing potential arbitrary code execution or denial of service. The CVSS 3.1 score is 9.8 (critical) with vector AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, indicating network attack vector, low attack complexity, no privileges or user interaction required, and high impact on confidentiality, integrity, and availability.
Potential Impact
Successful exploitation of this heap-based buffer overflow can result in arbitrary code execution, complete compromise of the affected system, or denial of service. The vulnerability is remotely exploitable without authentication or user interaction, making it highly severe.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are currently available. Until a patch is released, users should apply any recommended vendor mitigations if provided and monitor for updates.
CVE-2026-67873: n/a
Description
A heap-based buffer overflow vulnerability exists in lib60870-C version 2.4.0 within the server-side FileSegment ASDU encoding path. The flaw arises because the FileSegment_encode() function only validates the standalone segment length but does not check the remaining capacity of the current ASDU frame before encoding, potentially leading to memory corruption.
CVSS v3.1
Score 9.8critical
Affected software
pkg:github/mz-automation/lib60870Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-67873 is a critical heap-based buffer overflow vulnerability in lib60870-C 2.4.0 affecting the server-side FileSegment ASDU encoding path. The vulnerability occurs because the FileSegment_encode() function validates the segment length using FileSegment_GetMaxDataSize() but fails to verify the residual capacity of the ASDU frame before encoding object fields and segment data. This can lead to a heap overflow, causing potential arbitrary code execution or denial of service. The CVSS 3.1 score is 9.8 (critical) with vector AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, indicating network attack vector, low attack complexity, no privileges or user interaction required, and high impact on confidentiality, integrity, and availability.
Potential Impact
Successful exploitation of this heap-based buffer overflow can result in arbitrary code execution, complete compromise of the affected system, or denial of service. The vulnerability is remotely exploitable without authentication or user interaction, making it highly severe.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are currently available. Until a patch is released, users should apply any recommended vendor mitigations if provided and monitor for updates.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-vgf8-x653-r7r2
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-67873"]
- Ecosystems
- []
- Database Specific Severity
- CRITICAL
- Cvss Version
- 3.1
Threat ID: 6a74cf80bf8831d5391acd6b
Added to database: 08/06/2026, 18:16:32 UTC
Last enriched: 08/06/2026, 18:26:09 UTC
Last updated: 08/07/2026, 02:40:59 UTC
Views: 3
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