CVE-2026-67871

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-06. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this weekElevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: Elevated riskExposed: 0

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

Buffer Overflow vulnerability in Systerel S2OPC 1.7.3 allows a remote attacker to cause a denial of service via the AddNodes, address_space_bs.c, sopc_node_mgt_helper_internal.c, and toolkit_test_server

CVSS v3
7.5
EG Score
7.5(high)
EG Risk
65(Attend)
EG Risk 65/100SSVC: 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
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
39%
KEV
Not listed

Published

August 5, 2026

Last Modified

August 6, 2026

Advisory Details (4)

Auto-updated Aug 6, 2026
No patch confirmed yet.
generic

S2OPC/src/ClientServer/address_space/internal/sopc_node_mgt_helper_internal.c at S2OPC_Toolkit_1.7.3 · systerel/S2OPC · GitHub

https://github.com/systerel/S2OPC/blob/S2OPC_Toolkit_1.7.3/src/ClientServer/address_space/internal/sopc_node_mgt_helper_internal.c
generic

S2OPC/src/ClientServer/services/b2c/address_space_bs.c at S2OPC_Toolkit_1.7.3 · systerel/S2OPC · GitHub

https://github.com/systerel/S2OPC/blob/S2OPC_Toolkit_1.7.3/src/ClientServer/services/b2c/address_space_bs.c
generic

AddNodes type confusion allows a server-side heap-buffer-overflow read in S2OPC_Toolkit_1.7.3 (#1787) · Issues · Systerel / S2OPC · GitLab

https://gitlab.com/systerel/S2OPC/-/work_items/1787
generic

S2OPC/tests/ClientServer/CMakeLists.txt at S2OPC_Toolkit_1.7.3 · systerel/S2OPC · GitHub

https://github.com/systerel/S2OPC/blob/S2OPC_Toolkit_1.7.3/tests/ClientServer/CMakeLists.txt

Vendor Advisories for CVE-2026-67871(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 28× in last 7d / 66× 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 23:35 UTCEG score recompute
  2. 2026-08-20 23:35 UTCGHSA enrichment
  3. 2026-08-20 22:56 UTCEPSS rescore
  4. 2026-08-20 12:27 UTCGHSA enrichment
  5. 2026-08-20 01:19 UTCEG score recompute
  6. 2026-08-20 01:19 UTCGHSA enrichment
  7. 2026-08-19 17:04 UTCEPSS rescore
  8. 2026-08-19 14:10 UTCGHSA enrichment
  9. 2026-08-19 03:02 UTCGHSA enrichment
  10. 2026-08-18 15:47 UTCEG score recompute
  11. 2026-08-18 15:47 UTCGHSA enrichment
  12. 2026-08-18 13:48 UTCEPSS rescore
  13. 2026-08-18 04:21 UTCGHSA enrichment
  14. 2026-08-17 17:11 UTCEG score recompute
  15. 2026-08-17 17:11 UTCGHSA enrichment
  16. 2026-08-17 13:47 UTCEPSS rescore
  17. 2026-08-17 06:02 UTCGHSA enrichment
  18. 2026-08-16 18:50 UTCEG score recompute
  19. 2026-08-16 18:50 UTCGHSA enrichment
  20. 2026-08-16 14:56 UTCEPSS rescore
  21. 2026-08-16 07:35 UTCEG score recompute
  22. 2026-08-16 07:35 UTCGHSA enrichment
  23. 2026-08-15 20:27 UTCGHSA enrichment
  24. 2026-08-15 09:19 UTCEG score recompute
  25. 2026-08-15 09:19 UTCGHSA enrichment
Show 41 more
  1. 2026-08-15 01:30 UTCEPSS rescore
  2. 2026-08-14 22:11 UTCGHSA enrichment
  3. 2026-08-14 11:03 UTCGHSA enrichment
  4. 2026-08-13 23:55 UTCEG score recompute
  5. 2026-08-13 23:55 UTCGHSA enrichment
  6. 2026-08-13 22:00 UTCEPSS rescore
  7. 2026-08-13 12:46 UTCGHSA enrichment
  8. 2026-08-13 01:38 UTCGHSA enrichment
  9. 2026-08-12 14:30 UTCEG score recompute
  10. 2026-08-12 14:30 UTCGHSA enrichment
  11. 2026-08-12 13:51 UTCEPSS rescore
  12. 2026-08-12 03:22 UTCGHSA enrichment
  13. 2026-08-11 16:13 UTCEG score recompute
  14. 2026-08-11 16:13 UTCGHSA enrichment
  15. 2026-08-11 05:05 UTCEG score recompute
  16. 2026-08-11 05:05 UTCGHSA enrichment
  17. 2026-08-11 00:00 UTCEPSS rescore
  18. 2026-08-10 17:57 UTCGHSA enrichment
  19. 2026-08-10 06:43 UTCGHSA enrichment
  20. 2026-08-09 19:35 UTCEG score recompute
  21. 2026-08-09 19:35 UTCGHSA enrichment
  22. 2026-08-09 13:47 UTCEPSS rescore
  23. 2026-08-09 08:27 UTCGHSA enrichment
  24. 2026-08-08 21:19 UTCEG score recompute
  25. 2026-08-08 21:19 UTCGHSA enrichment
  26. 2026-08-08 16:37 UTCEPSS rescore
  27. 2026-08-08 10:10 UTCGHSA enrichment
  28. 2026-08-07 23:02 UTCEG score recompute
  29. 2026-08-07 23:02 UTCGHSA enrichment
  30. 2026-08-07 11:54 UTCGHSA enrichment
  31. 2026-08-07 00:45 UTCEG score recompute
  32. 2026-08-07 00:45 UTCGHSA enrichment
  33. 2026-08-06 13:47 UTCEPSS rescore
  34. 2026-08-06 13:37 UTCEG score recompute
  35. 2026-08-06 13:37 UTCGHSA enrichment
  36. 2026-08-06 13:09 UTCEG score recompute▲ 7.50
  37. 2026-08-06 13:09 UTCGHSA enrichment
  38. 2026-08-06 13:08 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
  39. 2026-08-06 00:19 UTCNVD update
  40. 2026-08-05 23:20 UTCEG score recompute
  41. 2026-08-05 23:20 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-67871?
CVE-2026-67871 is a high vulnerability published on August 5, 2026. Buffer Overflow vulnerability in Systerel S2OPC 1.7.3 allows a remote attacker to cause a denial of service via the AddNodes, addressspacebs.c, sopcnodemgthelperinternal.c, and toolkittestserver
When was CVE-2026-67871 disclosed?
CVE-2026-67871 was first published in the National Vulnerability Database on August 5, 2026, with the most recent update on August 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-67871 actively exploited?
CVE-2026-67871 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 61.3% of all scored CVEs.
What is the CVSS score of CVE-2026-67871?
CVE-2026-67871 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-67871?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-67871, 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

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