CVE-2026-51540

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-14. 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 — 3 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: 0%CVSS: 9.8Exploit: Elevated riskExposed: 0

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

OpENer 2.3.0 (master branch up to commit 76b95cf) is vulnerable to a severe memory corruption issue caused by an integer underflow in the processing of connected explicit messages (SendUnitData).

CVSS v3
9.8
EG Score
9.8(medium)
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
0%
EPSS %ILE
36%
KEV
Not listed

Published

July 13, 2026

Last Modified

August 11, 2026

Advisory Details (2)

Auto-updated Sep 16, 2026
No patch confirmed yet.
generic

Integer Underflow Leading to Stack Buffer Overflow in CIP Connected Message Path · Issue #568 · EIPStackGroup/OpENer · GitHub

https://github.com/EIPStackGroup/OpENer/issues/568
generic

CVE-2026-51540 · GitHub

https://gist.github.com/MrAlaskan/5e0c2af7f4a1d188814c7fa8f812c8da

Vendor Advisories for CVE-2026-51540(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 15× in last 7d / 92× 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 309 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-51540?
CVE-2026-51540 is a critical vulnerability published on July 13, 2026. OpENer 2.3.0 (master branch up to commit 76b95cf) is vulnerable to a severe memory corruption issue caused by an integer underflow in the processing of connected explicit messages (SendUnitData).
When was CVE-2026-51540 disclosed?
CVE-2026-51540 was first published in the National Vulnerability Database on July 13, 2026, with the most recent update on August 11, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-51540 actively exploited?
CVE-2026-51540 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 64.0% of all scored CVEs.
What is the CVSS score of CVE-2026-51540?
CVE-2026-51540 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-51540?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-51540, 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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