SB2026061835 - Multiple vulnerabilities in libIEC61850

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Main Vulnerability Database SB2026061835

SB2026061835 - Multiple vulnerabilities in libIEC61850

Published: June 18, 2026

Security Bulletin ID SB2026061835
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 vulnerabilities.


1) NULL pointer dereference (CVE-ID: CVE-2026-48741)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to a NULL pointer dereference in alternateArrayAccess() in the MMS read service when processing out-of-range sub-array read requests using alternate-access indexRange. A remote attacker can send a specially crafted MMS Read request to cause a denial of service.

Only MMS server implementations that use data models containing arrays are vulnerable.


2) Integer underflow (CVE-ID: CVE-2026-48503)

CWE-ID: CWE-191 - Integer underflow

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to integer underflow in the MMS file service when processing a fileOpen request with an out-of-range initialPosition followed by fileRead. A remote attacker can send crafted MMS file service requests to disclose sensitive information.

The disclosed data can include stale bytes from a previous fileRead response on the same connection, protocol fragments, and residual data left in the connection send buffer.


Remediation

Install update from vendor's website.

References