CVE-2026-48503 (GCVE-0-2026-48503)

Vulnerability from cvelistv5 – Published: 2026-10-16 15:44 – Updated: 2026-10-16 16:50
VLAI
Title
libIEC61850: Remote information disclosure in MMS file service via out-of-range initialPosition in fileOpen followed by fileRead
Summary
libIEC61850 is an open-source implementation of IEC 61850 client and server protocols including MMS, GOOSE, Sampled Values, and R-Session. Prior to 1.6.2, the MMS file service in src/mms/iso_mms/server/mms_file_service.c accepts an out-of-range initialPosition in fileOpen and stores it in the file-read state. The fileRead path then subtracts the larger read position from the file size using unsigned arithmetic and fails to limit the response to the actual FileSystem_readFile return value. The oversized response can include stale bytes from the reused connection buffer after the requested file contents, disclosing prior response data and protocol fragments to an unauthenticated remote client when the file service is enabled. This issue is fixed in version 1.6.2.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 16:50 UTC
CWE
  • CWE-191 - Integer Underflow (Wrap or Wraparound)
  • CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
  • CWE-252 - Unchecked Return Value
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7771 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
mz-automation libiec61850 Affected: < 1.6.2
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

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