CVE-2026-18790

LOWPre-NVD 3.33.3—
EchelonGraph scoreMEDIUM confidence

Score 3.3 from GitHub Security Advisory (severity: LOW) published 2026-08-04. A secondary CVSS source baseline 3.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
3.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 3.3Exploit: Elevated riskExposed services: Not assessed

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

A weakness has been identified in Systerel S2OPC up to 1.7.3. This affects the function LockedStaMac_ProcessMsg_DeleteMonitoredItemsResponse of the file src/ClientServer/frontend/client_wrapper/internal/state_machine.c of the component DeleteMonitoredItemsRequest Handler. This manipulation causes out-of-bounds read. The attack can only be executed locally. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

CVSS v3
3.3
EG Score
3.3LOWmedium confidence
EG Risk
31
EG Risk 31/100CISA 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
Severity33% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* 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, and watch the vendor's advisory for the fix.
EPSS PROB
0.2%
EPSS %ILE
4th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* 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, and watch the vendor's advisory for the fix.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (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 4, 2026

Last Modified

August 12, 2026

References (6)

Vendor Advisories for CVE-2026-18790(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 36× 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. 2026-10-04 23:21 UTCEPSS rescore
  2. 2026-10-04 06:10 UTCEG score recompute
  3. 2026-10-04 06:10 UTCGHSA enrichment
  4. 2026-10-01 19:49 UTCEPSS rescore
  5. 2026-10-01 02:26 UTCEG score recompute
  6. 2026-10-01 02:26 UTCGHSA enrichment
  7. 2026-09-30 15:02 UTCEPSS rescore
  8. 2026-09-29 15:20 UTCEPSS rescore
  9. 2026-09-28 13:51 UTCEPSS rescore
  10. 2026-09-27 18:01 UTCEG score recompute
  11. 2026-09-27 18:01 UTCGHSA enrichment
  12. 2026-09-27 13:47 UTCEPSS rescore
  13. 2026-09-26 15:58 UTCEPSS rescore
  14. 2026-09-22 21:24 UTCEG score recompute
  15. 2026-09-22 21:24 UTCGHSA enrichment
  16. 2026-09-19 23:23 UTCEG score recompute
  17. 2026-09-19 23:23 UTCGHSA enrichment
  18. 2026-09-18 19:27 UTCEPSS rescore
  19. 2026-09-17 01:11 UTCEG score recompute
  20. 2026-09-17 01:11 UTCGHSA enrichment
  21. 2026-09-16 14:07 UTCEPSS rescore
  22. 2026-09-16 05:14 UTCEPSS rescore
  23. 2026-09-13 22:38 UTCEG score recompute
  24. 2026-09-13 22:38 UTCGHSA enrichment
  25. 2026-09-13 16:46 UTCEPSS rescore
Show 68 more
  1. 2026-09-12 15:00 UTCEPSS rescore
  2. 2026-09-11 14:52 UTCEPSS rescore
  3. 2026-09-11 09:36 UTCEPSS rescore
  4. 2026-09-11 01:12 UTCEG score recompute
  5. 2026-09-11 01:12 UTCGHSA enrichment
  6. 2026-09-10 09:34 UTCEPSS rescore
  7. 2026-09-08 22:00 UTCEPSS rescore
  8. 2026-09-08 02:41 UTCEG score recompute
  9. 2026-09-08 02:41 UTCGHSA enrichment
  10. 2026-09-07 16:01 UTCEPSS rescore
  11. 2026-09-06 13:47 UTCEPSS rescore
  12. 2026-09-05 05:15 UTCEG score recompute
  13. 2026-09-05 05:15 UTCGHSA enrichment
  14. 2026-09-04 05:06 UTCEPSS rescore
  15. 2026-09-02 14:11 UTCEPSS rescore
  16. 2026-09-02 07:46 UTCEG score recompute
  17. 2026-09-02 07:46 UTCGHSA enrichment
  18. 2026-09-01 13:53 UTCEPSS rescore
  19. 2026-09-01 04:39 UTCEPSS rescore
  20. 2026-08-30 19:17 UTCEPSS rescore
  21. 2026-08-30 08:13 UTCEG score recompute
  22. 2026-08-30 08:13 UTCGHSA enrichment
  23. 2026-08-30 01:22 UTCEPSS rescore
  24. 2026-08-28 21:41 UTCEPSS rescore
  25. 2026-08-27 14:25 UTCEPSS rescore
  26. 2026-08-27 10:37 UTCEG score recompute
  27. 2026-08-27 10:37 UTCGHSA enrichment
  28. 2026-08-26 14:46 UTCEPSS rescore
  29. 2026-08-25 13:48 UTCEPSS rescore
  30. 2026-08-24 13:09 UTCEG score recompute
  31. 2026-08-24 13:09 UTCGHSA enrichment
  32. 2026-08-23 00:19 UTCEPSS rescore
  33. 2026-08-21 15:43 UTCEG score recompute
  34. 2026-08-21 15:43 UTCGHSA enrichment
  35. 2026-08-20 22:55 UTCEPSS rescore
  36. 2026-08-19 17:03 UTCEPSS rescore
  37. 2026-08-18 18:16 UTCEG score recompute
  38. 2026-08-18 18:16 UTCGHSA enrichment
  39. 2026-08-18 13:48 UTCEPSS rescore
  40. 2026-08-17 13:47 UTCEPSS rescore
  41. 2026-08-16 14:56 UTCEPSS rescore
  42. 2026-08-16 02:14 UTCEPSS rescore
  43. 2026-08-15 18:35 UTCEG score recompute
  44. 2026-08-15 18:35 UTCGHSA enrichment
  45. 2026-08-15 01:30 UTCEPSS rescore
  46. 2026-08-13 22:00 UTCEPSS rescore
  47. 2026-08-12 21:08 UTCEG score recompute
  48. 2026-08-12 21:08 UTCGHSA enrichment
  49. 2026-08-12 13:50 UTCEPSS rescore
  50. 2026-08-11 00:00 UTCEPSS rescore
  51. 2026-08-10 15:54 UTCEG score recompute
  52. 2026-08-10 15:54 UTCGHSA enrichment
  53. 2026-08-09 13:46 UTCEPSS rescore
  54. 2026-08-08 16:37 UTCEPSS rescore
  55. 2026-08-07 17:59 UTCEG score recompute
  56. 2026-08-07 17:59 UTCGHSA enrichment
  57. 2026-08-06 13:46 UTCEPSS rescore
  58. 2026-08-05 19:17 UTCEPSS rescore
  59. 2026-08-04 20:32 UTCEG score recompute
  60. 2026-08-04 20:32 UTCGHSA enrichment
  61. 2026-08-04 20:25 UTCNVD updateCVSS v4 → 1.9
  62. 2026-08-04 20:07 UTCEG score recompute
  63. 2026-08-04 20:07 UTCGHSA enrichment
  64. 2026-08-04 20:06 UTCMITRE cvelistV5CVSS v4 → 4.8
  65. 2026-08-04 18:24 UTCEG score recompute
  66. 2026-08-04 18:23 UTCNVD updateCVSS v4 → 1.9
  67. 2026-08-04 17:47 UTCEG score recompute
  68. 2026-08-04 17:46 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-18790?
CVE-2026-18790 is a low vulnerability published on August 4, 2026. A weakness has been identified in Systerel S2OPC up to 1.7.3. This affects the function LockedStaMacProcessMsgDeleteMonitoredItemsResponse of the file src/ClientServer/frontend/clientwrapper/internal/statemachine.c of the component DeleteMonitoredItemsRequest Handler. This manipulation causes…
When was CVE-2026-18790 disclosed?
CVE-2026-18790 was first published on August 4, 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-2026-18790 actively exploited?
CVE-2026-18790 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (4th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-18790?
CVE-2026-18790 has a CVSS base score of 3.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-18790?
No fix for CVE-2026-18790 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-2026-18790 are linked in the Vendor Advisories panel on this page.

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