CVE-2026-48503

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Source

https://cve.org/CVERecord?id=CVE-2026-48503

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-48503.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-48503

Aliases

GHSA-4c8m-jr3r-h8j2

Published

2026-10-16T15:44:47Z

Modified

2026-10-17T02:48:28Z

Severity

7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator

Summary

libIEC61850: Remote information disclosure in MMS file service via out-of-range initialPosition in fileOpen followed by fileRead

Details

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.

Database specific

{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-191",
        "CWE-200",
        "CWE-252"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48503.json"
}

References

Affected packages

Git / github.com/mz-automation/libiec61850

Affected ranges

Type

GIT

Repo

https://github.com/mz-automation/libiec61850

Events

Introduced

Fixed

f0f797bf955da763353f7081c892a1ff6b55e5a1

Database specific

Show details

{
    "extracted_events":  [
        {
            "introduced":  "0"
        },
        {
            "fixed":  "1.6.2"
        }
    ],
    "source":  "AFFECTED_FIELD"
}

Affected versions

v1.*

v1.0.0

v1.0.1

v1.1

v1.2.0

v1.2.1

v1.2.2

v1.3.0

v1.4.0

v1.4.1

v1.6.0

v1.6.1

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-48503.json"