CVE-2026-18582

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreHIGH confidence

Score 5.3 from GitHub Security Advisory published 2026-08-03. a secondary CVSS source baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

A security flaw has been discovered in mz-automation libiec61850 up to 1.6.1. This vulnerability affects the function Reporting_RCBWriteAccessHandler of the file src/iec61850/server/mms_mapping/reporting.c of the component Report Sending Path Handler. The manipulation results in free of memory not on the heap. It is possible to launch the attack remotely. The exploit has been released to the public and may be used for attacks. Upgrading to version 1.6.2 is able to resolve this issue. The patch is identified as 5b2a69f44256b8548927d8afdd7ac5f5381abe1e. It is suggested to upgrade the affected component. The vendor was contacted early about this disclosure.

CVSS v3
5.3
EG Score
5.3(high)
EG Risk
55(Attend)
EG Risk 55/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity53% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
41%
KEV
Not listed

Published

August 3, 2026

Last Modified

August 12, 2026

Advisory Details (5)

Auto-updated Aug 3, 2026
🔬 Proof of concept available. Patch available. Sources: github_release, github, github_commit.
generic

GitHub - mz-automation/libiec61850: Official repository for libIEC61850, the open-source library for the IEC 61850 protocols · GitHub

https://github.com/mz-automation/libiec61850/
github_release Patch Available

1.6.2

Patch available: mz-automation/libiec61850 v1.6.2

https://github.com/mz-automation/libiec61850/releases/tag/v1.6.2
github_commit Patch Available

commit 5b2a69f44256 (mz-automation/libiec61850)

Patch available: mz-automation/libiec61850 v1.6.2 (contains commit 5b2a69f44256)

https://github.com/mz-automation/libiec61850/commit/5b2a69f44256b8548927d8afdd7ac5f5381abe1e
generic

`Oversized RptID` can trigger `invalid free` of a stack-backed visible string in the `report send path` · Issue #2 · gff-cw/information · GitHub

https://github.com/gff-cw/information/issues/2
github Patch Available🟡 PoC Available

Oversized RptID can trigger invalid free of a stack-backed visible string in the report send path · Advisory · mz-automation/libiec61850 · GitHub

https://github.com/mz-automation/libiec61850/security/advisories/GHSA-7qg8-hm25-rv5v

Vendor Advisories for CVE-2026-18582(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 21× in last 7d / 60× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-20 22:55 UTCEPSS rescore
  2. 2026-08-20 18:48 UTCGHSA enrichment
  3. 2026-08-19 19:06 UTCEG score recompute
  4. 2026-08-19 19:06 UTCGHSA enrichment
  5. 2026-08-19 17:03 UTCEPSS rescore
  6. 2026-08-18 19:22 UTCEG score recompute
  7. 2026-08-18 19:22 UTCGHSA enrichment
  8. 2026-08-18 19:22 UTCGHSA enrichment
  9. 2026-08-18 13:48 UTCEPSS rescore
  10. 2026-08-17 19:40 UTCEG score recompute
  11. 2026-08-17 19:40 UTCGHSA enrichment
  12. 2026-08-17 13:47 UTCEPSS rescore
  13. 2026-08-16 19:58 UTCEG score recompute
  14. 2026-08-16 19:58 UTCGHSA enrichment
  15. 2026-08-16 14:56 UTCEPSS rescore
  16. 2026-08-16 02:14 UTCEPSS rescore
  17. 2026-08-15 20:16 UTCEG score recompute
  18. 2026-08-15 20:16 UTCGHSA enrichment
  19. 2026-08-15 01:30 UTCEPSS rescore
  20. 2026-08-14 20:33 UTCEG score recompute
  21. 2026-08-14 20:33 UTCGHSA enrichment
  22. 2026-08-13 22:00 UTCEPSS rescore
  23. 2026-08-13 20:51 UTCGHSA enrichment
  24. 2026-08-12 21:09 UTCGHSA enrichment
  25. 2026-08-12 15:29 UTCEG score recompute
Show 35 more
  1. 2026-08-12 15:28 UTCGHSA enrichment
  2. 2026-08-12 13:50 UTCEPSS rescore
  3. 2026-08-11 15:37 UTCEG score recompute
  4. 2026-08-11 15:37 UTCGHSA enrichment
  5. 2026-08-11 13:42 UTCEPSS rescore
  6. 2026-08-11 00:00 UTCEPSS rescore
  7. 2026-08-10 15:55 UTCGHSA enrichment
  8. 2026-08-09 15:55 UTCEG score recompute
  9. 2026-08-09 15:55 UTCGHSA enrichment
  10. 2026-08-09 13:46 UTCEPSS rescore
  11. 2026-08-08 16:37 UTCEPSS rescore
  12. 2026-08-08 16:13 UTCGHSA enrichment
  13. 2026-08-07 16:30 UTCEG score recompute
  14. 2026-08-07 16:30 UTCGHSA enrichment
  15. 2026-08-06 16:48 UTCEG score recompute
  16. 2026-08-06 16:48 UTCGHSA enrichment
  17. 2026-08-06 13:46 UTCEPSS rescore
  18. 2026-08-05 19:17 UTCEPSS rescore
  19. 2026-08-05 17:06 UTCGHSA enrichment
  20. 2026-08-04 17:22 UTCEG score recompute
  21. 2026-08-04 17:22 UTCGHSA enrichment
  22. 2026-08-04 15:10 UTCEPSS rescore
  23. 2026-08-04 10:38 UTCEPSS rescore
  24. 2026-08-03 17:40 UTCEG score recompute
  25. 2026-08-03 17:40 UTCGHSA enrichment
  26. 2026-08-03 17:36 UTCNVD updateCVSS v4 → 5.5
  27. 2026-08-03 16:19 UTCEG score recompute
  28. 2026-08-03 16:19 UTCGHSA enrichment
  29. 2026-08-03 06:39 UTCEG score recompute
  30. 2026-08-03 06:39 UTCGHSA enrichment
  31. 2026-08-03 06:33 UTCMITRE cvelistV5CVSS v4 → 6.9
  32. 2026-08-03 02:22 UTCEG score recompute
  33. 2026-08-03 02:22 UTCNVD updateCVSS v4 → 5.5
  34. 2026-08-03 01:49 UTCEG score recompute
  35. 2026-08-03 01:48 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-18582?
CVE-2026-18582 is a medium vulnerability published on August 3, 2026. A security flaw has been discovered in mz-automation libiec61850 up to 1.6.1. This vulnerability affects the function ReportingRCBWriteAccessHandler of the file src/iec61850/server/mmsmapping/reporting.c of the component Report Sending Path Handler. The manipulation results in free of memory not on…
When was CVE-2026-18582 disclosed?
CVE-2026-18582 was first published in the National Vulnerability Database on August 3, 2026, with the most recent update on August 12, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18582 actively exploited?
CVE-2026-18582 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 59.4% of all scored CVEs.
What is the CVSS score of CVE-2026-18582?
CVE-2026-18582 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-18582?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18582, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-18582

Explore →

Is Your Infrastructure Affected by CVE-2026-18582?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs