Buffer Overflow in libIEC61850 Affects Open-source IEC 61850 Implementations
CVE-2026-68908

5.3MEDIUM

Key Information:

Vendor

Mz-automation

Status
Libiec61850
Vendor
CVE Published:
16 October 2026

What is CVE-2026-68908?

The libIEC61850 library, an open-source implementation of IEC 61850 protocols, contains a vulnerability where the reporting mechanism permits an oversized RptID greater than 129 bytes. This flaw resides in the report-control-block write path, where improper handling of the oversized identifier can lead to a server crash. Specifically, when the sendNextReportEntrySegment function processes this oversized RptID, it can free a stack-allocated buffer incorrectly, allowing a remote attacker to trigger an invalid free. This issue has been addressed in version 1.6.2 of the library.

Affected Version(s)

libiec61850 < 1.6.2

References

https://github.com/mz-automation/libiec61850/security/adv...
x_refsource_CONFIRM
https://github.com/mz-automation/libiec61850/commit/5b2a6...
x_refsource_MISC
https://github.com/mz-automation/libiec61850/releases/tag...
x_refsource_MISC

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.