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  4. CVE 2026 48503 libiec61850 remote information disclosure in mms
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Back to active CVEs
High · CVSS 7.5CVE-2026-48503

libIEC61850: Remote information disclosure in MMS file service via out-of-range initialPosition in fileOpen followed by fileReadCVE-2026-48503

Answer in brief

CVE-2026-48503 records a High severity (CVSS 7.5) vulnerability in libIEC61850: Remote information disclosure in MMS file service via out-of-range initialPosition in fileOpen followed by fileRead. The current sources do not mark it as known exploited. The current feed maps mz-automation/libiec61850 (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 16, 2026Updated Oct 16, 2026Source checked Oct 16, 2026First seen by HOL Oct 16, 2026Material review Oct 16, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.5
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps mz-automation/libiec61850 (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
mz-automation/libiec61850generic<1.6.21.6.2

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for mz-automation/libiec61850.
  2. 2Review the reported fix. Update mz-automation/libiec61850 to 1.6.2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 16, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 16, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 16, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • libIEC61850: Remote NULL dereference in MMS Read alternate-access sub-array path leads to server-side DoSSame mz-automation/libiec61850 package
  • libIEC61850: Server-side double free in MMS ObtainFile task reuse due to stale FILE* handleSame mz-automation/libiec61850 package
  • libIEC61850: Infinite loop and out-of-bounds read in ACSE parseUserInformation when parsing a malformed AARE PDUSame mz-automation/libiec61850 package
  • libIEC61850: Server-side out-of-bounds stack read in association-specific dynamic dataset creation due to reversed StringUtils_copyStringToBuffer argumentsSame mz-automation/libiec61850 package
  • libIEC61850: Oversized RptID can trigger invalid free of a stack-backed visible string in the report send pathSame mz-automation/libiec61850 package
  • RIOT: DHCPv6 client _parse_reply() missing sub-option length check leads to size_t underflow and unbounded OOB heap readAlso CWE-191

Record context

Vulnerability class
Arbitrary File Read
EPSS
Not reported
CWE IDs
CWE-191, CWE-200, CWE-252
Source
CVE List V5
Source checked
Oct 16, 2026
References
3 linked sources
Open source record