CVE-2026-68908
libIEC61850: Oversized RptID can trigger invalid free of a stack-backed visible string in the report send path
- 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, Reporting_RCBWriteAccessHandler accepts an RptID longer than 129 bytes in the report-control-block write path. When GI later causes sendNextReportEntrySegment to serialize the report, the function wraps rptIdBuf[130] as a temporary MmsValue and passes it to MmsValue_setVisibleString. The setter's resize path frees the stack-backed buffer, allowing a remote client to trigger an invalid free and server crash by writing the oversized RptID and then generating a report. This issue is fixed in version 1.6.2.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | Medium5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
| NVDNVD · Deferred | 3.1 | Medium5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
- EPSS (exploitation in 30 days)
- 0.45% · top 61% of all CVEs (7 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: Medium 5.3.
Weakness
- CWE-590: Free of Memory not on the Heap (opens in a new tab)All about CWE-590 and its CVEs
- CWE-664: Improper Control of a Resource Through its Lifetime (opens in a new tab)All about CWE-664 and its CVEs
- CWE-763: Release of Invalid Pointer or Reference (opens in a new tab)All about CWE-763 and its CVEs
Affected products
- affected < 1.6.2
References (3)
- https://github.com/mz-automation/libiec61850/security/advisories/GHSA-7qg8-hm25-rv5v (opens in a new tab)x_refsource_CONFIRMexploit
- https://github.com/mz-automation/libiec61850/commit/5b2a69f44256b8548927d8afdd7ac5f5381abe1e (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-2026-68908)Record last updated .