CVE-2026-67873

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-06. 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.

A heap-based buffer overflow exists in lib60870-C 2.4.0 in the server-side FileSegment ASDU encoding path. The issue occurs because FileSegment_encode() validates only the standalone segment length via FileSegment_GetMaxDataSize() and does not verify the residual capacity of the current ASDU frame before encoding object fields and segment data

CVSS v3
9.8
EG Score
9.8(high)
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
34%
KEV
Not listed

Published

August 5, 2026

Last Modified

August 6, 2026

Advisory Details (4)

Auto-updated Aug 20, 2026
Patch available. Sources: github_release.
generic

Heap-Based Buffer Overflow in `FileSegment` ASDU Encoding (`CS101_ASDU_addInformationObject` / `FileSegment_encode`) · Issue #201 · mz-automation/lib60870 · GitHub

https://github.com/mz-automation/lib60870/issues/201
github_release Patch Available

2.4.0

Patch available: mz-automation/lib60870 v2.4.0

https://github.com/mz-automation/lib60870/releases/tag/v2.4.0
generic

lib60870/user_guide.adoc at master · mz-automation/lib60870 · GitHub

https://github.com/mz-automation/lib60870/blob/master/user_guide.adoc
generic

GitHub - mz-automation/lib60870: Official repository for lib60870 an implementation of the IEC 60870-5-101/104 protocol (read-only mirror) · GitHub

https://github.com/mz-automation/lib60870

Vendor Advisories for CVE-2026-67873(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 51× in last 7d / 116× 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 116 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-67873?
CVE-2026-67873 is a critical vulnerability published on August 5, 2026. A heap-based buffer overflow exists in lib60870-C 2.4.0 in the server-side FileSegment ASDU encoding path. The issue occurs because FileSegmentencode() validates only the standalone segment length via FileSegmentGetMaxDataSize() and does not verify the residual capacity of the current ASDU frame…
When was CVE-2026-67873 disclosed?
CVE-2026-67873 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-2026-67873 actively exploited?
CVE-2026-67873 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 66.4% of all scored CVEs.
What is the CVSS score of CVE-2026-67873?
CVE-2026-67873 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-67873?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-67873, 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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