CVE-2026-67868

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-18. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 5 sources updated this weekElevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: Elevated riskExposed: 0

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

A heap-based out-of-bounds write vulnerability exists in S2OPC 1.7.3 in server-side EventFilter handling during CreateMonitoredItems processing. This allows a remote attacker to execute arbitrary code.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
75(Attend)
EG Risk 75/100SSVC: 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
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
45%
KEV
Not listed

Published

August 17, 2026

Last Modified

August 18, 2026

Advisory Details (5)

Auto-updated Aug 18, 2026
No patch confirmed yet.
generic

Server-side `heap-buffer-overflow` in EventFilter WhereClause result handling · Issue #16 · gff-cw/information · GitHub

https://github.com/gff-cw/information/issues/16
generic

Server-side heap-buffer-overflow in EventFilter WhereClause result handling (#1779) · Issues · Systerel / S2OPC · GitLab

https://gitlab.com/systerel/S2OPC/-/work_items/1779
generic

S2OPC/samples/ClientServer/demo_server_alarms at S2OPC_Toolkit_1.7.3 · systerel/S2OPC · GitHub

https://github.com/systerel/S2OPC/tree/S2OPC_Toolkit_1.7.3/samples/ClientServer/demo_server_alarms
generic

S2OPC/src/ClientServer/services/b2c/monitored_item_event_filter_where_clause_bs.c at b4c5c7d63cd69698461d514b905a7c92b3c377c4 · systerel/S2OPC · GitHub

https://github.com/systerel/S2OPC/blob/b4c5c7d63cd69698461d514b905a7c92b3c377c4/src/ClientServer/services/b2c/monitored_item_event_filter_where_clause_bs.c
generic

S2OPC/src/ClientServer/services/b2c/monitored_item_event_filter_treatment_bs.c at b4c5c7d63cd69698461d514b905a7c92b3c377c4 · systerel/S2OPC · GitHub

https://github.com/systerel/S2OPC/blob/b4c5c7d63cd69698461d514b905a7c92b3c377c4/src/ClientServer/services/b2c/monitored_item_event_filter_treatment_bs.c

Vendor Advisories for CVE-2026-67868(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 31× in last 7d / 31× 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. 2026-08-21 07:30 UTCGHSA enrichment
  2. 2026-08-21 03:49 UTCGHSA enrichment
  3. 2026-08-21 00:08 UTCEG score recompute
  4. 2026-08-21 00:08 UTCGHSA enrichment
  5. 2026-08-20 22:56 UTCEPSS rescore
  6. 2026-08-20 20:28 UTCGHSA enrichment
  7. 2026-08-20 16:47 UTCGHSA enrichment
  8. 2026-08-20 13:05 UTCGHSA enrichment
  9. 2026-08-20 09:19 UTCGHSA enrichment
  10. 2026-08-20 05:39 UTCGHSA enrichment
  11. 2026-08-20 01:58 UTCGHSA enrichment
  12. 2026-08-19 22:17 UTCGHSA enrichment
  13. 2026-08-19 18:36 UTCEG score recompute
  14. 2026-08-19 18:36 UTCGHSA enrichment
  15. 2026-08-19 17:04 UTCEPSS rescore
  16. 2026-08-19 14:55 UTCGHSA enrichment
  17. 2026-08-19 11:14 UTCGHSA enrichment
  18. 2026-08-19 07:32 UTCGHSA enrichment
  19. 2026-08-19 03:50 UTCGHSA enrichment
  20. 2026-08-19 00:10 UTCGHSA enrichment
  21. 2026-08-18 20:27 UTCEG score recompute
  22. 2026-08-18 20:27 UTCGHSA enrichment
  23. 2026-08-18 16:46 UTCEG score recompute
  24. 2026-08-18 16:46 UTCGHSA enrichment
  25. 2026-08-18 15:59 UTCEG score recompute▲ 9.80
Show 6 more
  1. 2026-08-18 15:59 UTCGHSA enrichment
  2. 2026-08-18 15:59 UTCMITRE cvelistV5CVSS v3 → 9.8 · severity → CRITICAL
  3. 2026-08-18 13:48 UTCEPSS rescore
  4. 2026-08-17 22:20 UTCNVD update
  5. 2026-08-17 22:00 UTCEG score recompute
  6. 2026-08-17 21:59 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-67868?
CVE-2026-67868 is a critical vulnerability published on August 17, 2026. A heap-based out-of-bounds write vulnerability exists in S2OPC 1.7.3 in server-side EventFilter handling during CreateMonitoredItems processing. This allows a remote attacker to execute arbitrary code.
When was CVE-2026-67868 disclosed?
CVE-2026-67868 was first published in the National Vulnerability Database on August 17, 2026, with the most recent update on August 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-67868 actively exploited?
CVE-2026-67868 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 55.0% of all scored CVEs.
What is the CVSS score of CVE-2026-67868?
CVE-2026-67868 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-67868?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-67868, 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.

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