CVE-2026-67871

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM 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 mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.8%CVSS: 7.5Exploit: Elevated riskExposed services: Not assessed

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

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
7.5HIGHmedium confidence
EG Risk
65
EG Risk 65/100CISA SSVC

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%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.8%
EPSS %ILE
55th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 5, 2026

Last Modified

August 31, 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 19× in last 7d / 88× 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.

Showing the most recent 100 of 205 total refreshes for this CVE.

  1. 2026-10-04 23:38 UTCEG score recompute
  2. 2026-10-04 23:38 UTCGHSA enrichment
  3. 2026-10-04 23:22 UTCEPSS rescore
  4. 2026-10-04 06:08 UTCEG score recompute
  5. 2026-10-04 06:08 UTCGHSA enrichment
  6. 2026-10-03 14:26 UTCEPSS rescore
  7. 2026-10-03 01:53 UTCEG score recompute
  8. 2026-10-03 01:53 UTCGHSA enrichment
  9. 2026-10-02 17:56 UTCEPSS rescore
  10. 2026-10-02 10:05 UTCEG score recompute
  11. 2026-10-02 10:05 UTCGHSA enrichment
  12. 2026-10-01 19:50 UTCEPSS rescore
  13. 2026-10-01 13:33 UTCGHSA enrichment
  14. 2026-10-01 02:24 UTCEG score recompute
  15. 2026-10-01 02:24 UTCGHSA enrichment
  16. 2026-09-30 15:03 UTCEPSS rescore
  17. 2026-09-29 06:23 UTCEG score recompute
  18. 2026-09-29 06:23 UTCGHSA enrichment
  19. 2026-09-28 13:52 UTCEPSS rescore
  20. 2026-09-28 05:02 UTCGHSA enrichment
  21. 2026-09-27 17:54 UTCEG score recompute
  22. 2026-09-27 17:54 UTCGHSA enrichment
  23. 2026-09-27 13:48 UTCEPSS rescore
  24. 2026-09-26 15:59 UTCEPSS rescore
  25. 2026-09-25 04:39 UTCEG score recompute
Show 75 more
  1. 2026-09-25 04:39 UTCGHSA enrichment
  2. 2026-09-24 12:59 UTCGHSA enrichment
  3. 2026-09-24 01:50 UTCEG score recompute
  4. 2026-09-24 01:50 UTCGHSA enrichment
  5. 2026-09-23 17:54 UTCEPSS rescore
  6. 2026-09-23 14:42 UTCGHSA enrichment
  7. 2026-09-23 02:18 UTCEG score recompute
  8. 2026-09-23 02:18 UTCGHSA enrichment
  9. 2026-09-22 15:09 UTCGHSA enrichment
  10. 2026-09-22 03:01 UTCEG score recompute
  11. 2026-09-22 03:01 UTCGHSA enrichment
  12. 2026-09-20 20:51 UTCEG score recompute
  13. 2026-09-20 20:51 UTCGHSA enrichment
  14. 2026-09-20 20:16 UTCEPSS rescore
  15. 2026-09-20 02:05 UTCEG score recompute
  16. 2026-09-20 02:04 UTCGHSA enrichment
  17. 2026-09-19 14:55 UTCGHSA enrichment
  18. 2026-09-19 03:32 UTCEG score recompute
  19. 2026-09-19 03:31 UTCGHSA enrichment
  20. 2026-09-18 19:28 UTCEPSS rescore
  21. 2026-09-18 14:49 UTCGHSA enrichment
  22. 2026-09-18 03:19 UTCEG score recompute
  23. 2026-09-18 03:19 UTCGHSA enrichment
  24. 2026-09-17 16:11 UTCGHSA enrichment
  25. 2026-09-17 01:10 UTCEG score recompute
  26. 2026-09-17 01:10 UTCGHSA enrichment
  27. 2026-09-16 14:08 UTCEPSS rescore
  28. 2026-09-16 05:15 UTCEPSS rescore
  29. 2026-09-16 05:15 UTCGHSA enrichment
  30. 2026-09-15 16:45 UTCEG score recompute
  31. 2026-09-15 16:44 UTCGHSA enrichment
  32. 2026-09-15 01:36 UTCGHSA enrichment
  33. 2026-09-14 11:10 UTCGHSA enrichment
  34. 2026-09-14 00:01 UTCEG score recompute
  35. 2026-09-14 00:01 UTCGHSA enrichment
  36. 2026-09-13 12:53 UTCGHSA enrichment
  37. 2026-09-13 01:45 UTCEG score recompute
  38. 2026-09-13 01:45 UTCGHSA enrichment
  39. 2026-09-12 14:36 UTCGHSA enrichment
  40. 2026-09-12 03:28 UTCGHSA enrichment
  41. 2026-09-11 16:19 UTCEG score recompute
  42. 2026-09-11 16:19 UTCGHSA enrichment
  43. 2026-09-11 14:53 UTCEPSS rescore
  44. 2026-09-11 09:37 UTCEPSS rescore
  45. 2026-09-11 05:07 UTCGHSA enrichment
  46. 2026-09-10 17:59 UTCEG score recompute
  47. 2026-09-10 17:58 UTCGHSA enrichment
  48. 2026-09-10 06:47 UTCGHSA enrichment
  49. 2026-09-09 19:24 UTCGHSA enrichment
  50. 2026-09-09 06:33 UTCEG score recompute
  51. 2026-09-09 06:33 UTCGHSA enrichment
  52. 2026-09-08 22:01 UTCEPSS rescore
  53. 2026-09-08 08:15 UTCGHSA enrichment
  54. 2026-09-07 18:28 UTCEG score recompute
  55. 2026-09-07 18:28 UTCGHSA enrichment
  56. 2026-09-07 16:01 UTCEPSS rescore
  57. 2026-09-06 16:49 UTCEG score recompute
  58. 2026-09-06 16:49 UTCGHSA enrichment
  59. 2026-09-06 13:47 UTCEPSS rescore
  60. 2026-09-06 05:41 UTCGHSA enrichment
  61. 2026-09-05 18:31 UTCEG score recompute
  62. 2026-09-05 18:31 UTCGHSA enrichment
  63. 2026-09-05 15:31 UTCEPSS rescore
  64. 2026-09-05 04:02 UTCEG score recompute
  65. 2026-09-05 04:02 UTCGHSA enrichment
  66. 2026-09-04 10:05 UTCEG score recompute
  67. 2026-09-04 10:05 UTCGHSA enrichment
  68. 2026-09-04 05:07 UTCEPSS rescore
  69. 2026-09-03 20:40 UTCGHSA enrichment
  70. 2026-09-03 07:17 UTCEG score recompute
  71. 2026-09-03 07:17 UTCGHSA enrichment
  72. 2026-09-02 14:12 UTCEPSS rescore
  73. 2026-09-02 07:56 UTCGHSA enrichment
  74. 2026-09-01 20:47 UTCEG score recompute
  75. 2026-09-01 20:47 UTCGHSA enrichment

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 on August 5, 2026, with the most recent update on August 31, 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 0.8% probability of exploitation in the next 30 days (55th percentile of EPSS-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?
No fix for CVE-2026-67871 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-67871 are linked in the Vendor Advisories panel on this page.

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