CVE-2026-54410

HIGHPre-NVD 8.68.6—
EchelonGraph scoreMEDIUM confidence

Score 8.6 from GitHub Security Advisory (severity: HIGH) published 2026-06-14. a secondary CVSS source baseline 8.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.6
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 8.6Exploit: NoneExposed: 0

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

nanoMODBUS through v1.23.0 contains an off-by-one buffer overflow in the recv_msg_header() function of the Modbus/TCP server that allows remote unauthenticated attackers to write one attacker-controlled byte past the end of the 260-byte receive buffer by sending a crafted MBAP frame whose Length field is set to 255. The overflow corrupts the adjacent buffer-index field of the nanoMODBUS state structure, resulting in denial of service through invalid memory accesses and, on bare-metal and RTOS targets without memory protection, one-byte information disclosure and writes to unintended register addresses on the Write Multiple Registers (FC16) handler path.

CVSS v3
8.6
EG Score
8.6(medium)
EG Risk
54(Track)
EG Risk 54/100SSVC: Track

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
Severity86% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
42.1%
KEV
Not listed

Published

June 14, 2026

Last Modified

June 16, 2026

Advisory Details (4)

Auto-updated Jun 15, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic🔴 Active Exploitation

CWE - CWE-787: Out-of-bounds Write (4.20)

https://cwe.mitre.org/data/definitions/787.html
generic

CWE - CWE-193: Off-by-one Error (4.20)

https://cwe.mitre.org/data/definitions/193.html
generic

nanoMODBUS/nanomodbus.c at v1.23.0 · debevv/nanoMODBUS · GitHub

https://github.com/debevv/nanoMODBUS/blob/v1.23.0/nanomodbus.c#L369
generic

GitHub - debevv/nanoMODBUS: A compact MODBUS RTU/TCP C library for embedded/microcontrollers · GitHub

https://github.com/debevv/nanoMODBUS

Vendor Advisories for CVE-2026-54410(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 10× in last 7d / 87× 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 119 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-54410?
CVE-2026-54410 is a high vulnerability published on June 14, 2026. nanoMODBUS through v1.23.0 contains an off-by-one buffer overflow in the recvmsgheader() function of the Modbus/TCP server that allows remote unauthenticated attackers to write one attacker-controlled byte past the end of the 260-byte receive buffer by sending a crafted MBAP frame whose Length…
When was CVE-2026-54410 disclosed?
CVE-2026-54410 was first published in the National Vulnerability Database on June 14, 2026, with the most recent update on June 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54410 actively exploited?
CVE-2026-54410 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 42.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-54410?
CVE-2026-54410 has a CVSS v3 base score of 8.6 (NVD).
How do I remediate CVE-2026-54410?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54410, 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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