CVE-2026-48741
libIEC61850: Remote NULL dereference in MMS Read alternate-access sub-array path leads to server-side DoS
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
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, alternateArrayAccess in src/mms/iso_mms/server/mms_read_service.c does not validate an alternate-access sub-array range when numberOfElements is greater than zero. An out-of-range MmsValue_getElement call returns NULL, and the sub-array branch passes that value to MmsValue_isDeletable, causing a NULL pointer dereference. A remote MMS Read request can therefore crash servers whose data models contain arrays, while the single-element error path handles the same invalid index safely. This issue is fixed in version 1.6.2.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Deferred | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.52% · top 55% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: poc · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Weakness
- CWE-129: Improper Validation of Array Index (opens in a new tab)All about CWE-129 and its CVEs
- CWE-252: Unchecked Return Value (opens in a new tab)All about CWE-252 and its CVEs
- CWE-476: NULL Pointer Dereference (opens in a new tab)All about CWE-476 and its CVEs
- CWE-754: Improper Check for Unusual or Exceptional Conditions (opens in a new tab)All about CWE-754 and its CVEs
Affected products
- affected < 1.6.2
References (3)
- https://github.com/mz-automation/libiec61850/security/advisories/GHSA-8mfr-hq64-9w33 (opens in a new tab)x_refsource_CONFIRMexploit
- https://github.com/mz-automation/libiec61850/commit/7c15310405def00cac628ebde4ce1404bfb8a411 (opens in a new tab)x_refsource_MISC
- https://github.com/mz-automation/libiec61850/releases/tag/v1.6.2 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-48741)Record last updated .