CVE-2026-19206 Details
Description
A security flaw has been discovered in MZ Automation libiec61850 up to 1.6.1. This affects the function SVReceiver_stopThreadless of the file src/sampled_values/sv_subscriber.c of the component ASDU Element Handler. Performing a manipulation results in heap-based buffer overflow. The attack must be initiated from a local position. The exploit has been released to the public and may be used for attacks. Upgrading to version 1.6.2 is able to mitigate this issue. The patch is named a96bd674e0238276dd1387d31d52e55229d0771e. The affected component should be upgraded.
A heap-based buffer overflow vulnerability has been identified in the MZ Automation Libiec61850 library, specifically in versions prior to 1.6.1. The issue arises in the SVReceiver_stopThreadless function within the ASDU Element Handler component, located in the sv_subscriber.c file. This vulnerability can be exploited locally by sending a crafted Sampled Values (SV) frame that manipulates the 'confRev' field, which is improperly validated. The flaw has been publicly disclosed and can lead to a subscriber-side crash, causing a denial-of-service condition.
Users are advised to upgrade to Libiec61850 version 1.6.2, which addresses the vulnerability by implementing proper length validations for fixed-width fields in the SV subscriber component.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Aug 7, 2026CISA-ADP
Assessed Aug 7, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/mz-automation/libiec61850/commit/a96bd674e0238276dd1387d31d52e55229d0771e | [email protected] | Source CodeVendor |
| https://github.com/mz-automation/libiec61850/issues/598 | [email protected] | ExploitIssue TrackingTechnical AnalysisVendor |
| https://github.com/mz-automation/libiec61850/issues/598#issuecomment-4858659113 | [email protected] | ExploitIssue TrackingTechnical AnalysisVendor |
| https://github.com/mz-automation/libiec61850/releases/tag/v1.6.2 | [email protected] | Release NotesVendor |
| https://vuldb.com/cve/CVE-2026-19206 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/submit/864840 | [email protected] | Issue TrackingPermission Required |
| https://vuldb.com/vuln/386950 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/vuln/386950/cti | [email protected] | AdvisoryContent Wall |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-119 | Improper Restriction of Operations within the Bounds of a Memory Buffer | [email protected] |
| CWE-122 | Heap-based Buffer Overflow | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| MZ Automation libiec61850 | <= 1.6.1 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Aug 7, 2026 | CVE Modified | CISA-ADP |
| Aug 7, 2026 | New CVE Received | [email protected] |