CVE-2026-67873

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM 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: 0.7%CVSS: 9.8Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

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
9.8CRITICALmedium confidence
EG Risk
75
EG Risk 75/100CISA 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
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.7%
EPSS %ILE
52nd
KEV
Not listed

CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (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 Sep 28, 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 22× in last 7d / 136× 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 338 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 12:25 UTCGHSA enrichment
  5. 2026-10-04 06:08 UTCEG score recompute
  6. 2026-10-04 06:08 UTCGHSA enrichment
  7. 2026-10-03 14:26 UTCEPSS rescore
  8. 2026-10-03 01:50 UTCEG score recompute
  9. 2026-10-03 01:50 UTCGHSA enrichment
  10. 2026-10-02 17:56 UTCEPSS rescore
  11. 2026-10-02 16:45 UTCGHSA enrichment
  12. 2026-10-02 10:04 UTCEG score recompute
  13. 2026-10-02 10:04 UTCGHSA enrichment
  14. 2026-10-01 19:50 UTCEPSS rescore
  15. 2026-10-01 15:15 UTCGHSA enrichment
  16. 2026-10-01 10:57 UTCGHSA enrichment
  17. 2026-10-01 06:40 UTCGHSA enrichment
  18. 2026-10-01 02:24 UTCEG score recompute
  19. 2026-10-01 02:24 UTCGHSA enrichment
  20. 2026-09-30 15:03 UTCEPSS rescore
  21. 2026-09-29 06:23 UTCEG score recompute
  22. 2026-09-29 06:23 UTCGHSA enrichment
  23. 2026-09-28 13:52 UTCEPSS rescore
  24. 2026-09-28 12:50 UTCGHSA enrichment
  25. 2026-09-28 07:05 UTCGHSA enrichment
Show 75 more
  1. 2026-09-28 02:46 UTCGHSA enrichment
  2. 2026-09-27 17:54 UTCEG score recompute
  3. 2026-09-27 17:54 UTCGHSA enrichment
  4. 2026-09-27 13:48 UTCEPSS rescore
  5. 2026-09-26 15:59 UTCEPSS rescore
  6. 2026-09-25 09:07 UTCGHSA enrichment
  7. 2026-09-25 04:39 UTCEG score recompute
  8. 2026-09-25 04:39 UTCGHSA enrichment
  9. 2026-09-24 10:17 UTCGHSA enrichment
  10. 2026-09-24 06:00 UTCGHSA enrichment
  11. 2026-09-24 01:44 UTCGHSA enrichment
  12. 2026-09-23 21:22 UTCEG score recompute
  13. 2026-09-23 21:22 UTCGHSA enrichment
  14. 2026-09-23 17:54 UTCEPSS rescore
  15. 2026-09-23 14:35 UTCGHSA enrichment
  16. 2026-09-23 10:15 UTCGHSA enrichment
  17. 2026-09-23 05:58 UTCGHSA enrichment
  18. 2026-09-23 01:41 UTCGHSA enrichment
  19. 2026-09-22 21:23 UTCEG score recompute
  20. 2026-09-22 21:23 UTCGHSA enrichment
  21. 2026-09-22 13:04 UTCGHSA enrichment
  22. 2026-09-22 07:23 UTCGHSA enrichment
  23. 2026-09-22 03:01 UTCEG score recompute
  24. 2026-09-22 03:01 UTCGHSA enrichment
  25. 2026-09-20 20:51 UTCEG score recompute
  26. 2026-09-20 20:51 UTCGHSA enrichment
  27. 2026-09-20 20:16 UTCEPSS rescore
  28. 2026-09-20 11:02 UTCGHSA enrichment
  29. 2026-09-20 03:40 UTCGHSA enrichment
  30. 2026-09-19 23:22 UTCGHSA enrichment
  31. 2026-09-19 17:43 UTCEG score recompute
  32. 2026-09-19 17:42 UTCGHSA enrichment
  33. 2026-09-19 13:22 UTCGHSA enrichment
  34. 2026-09-19 08:06 UTCGHSA enrichment
  35. 2026-09-19 03:50 UTCGHSA enrichment
  36. 2026-09-18 23:32 UTCEG score recompute
  37. 2026-09-18 23:32 UTCGHSA enrichment
  38. 2026-09-18 19:28 UTCEPSS rescore
  39. 2026-09-18 19:12 UTCGHSA enrichment
  40. 2026-09-18 14:49 UTCGHSA enrichment
  41. 2026-09-18 09:42 UTCGHSA enrichment
  42. 2026-09-18 05:25 UTCGHSA enrichment
  43. 2026-09-18 01:08 UTCEG score recompute
  44. 2026-09-18 01:08 UTCGHSA enrichment
  45. 2026-09-17 16:10 UTCGHSA enrichment
  46. 2026-09-17 09:44 UTCGHSA enrichment
  47. 2026-09-17 05:27 UTCGHSA enrichment
  48. 2026-09-17 01:10 UTCEG score recompute
  49. 2026-09-17 01:10 UTCGHSA enrichment
  50. 2026-09-16 14:08 UTCEPSS rescore
  51. 2026-09-16 11:14 UTCEG score recompute
  52. 2026-09-16 11:14 UTCGHSA enrichment
  53. 2026-09-16 05:15 UTCEPSS rescore
  54. 2026-09-16 03:46 UTCGHSA enrichment
  55. 2026-09-15 16:42 UTCGHSA enrichment
  56. 2026-09-15 06:53 UTCEG score recompute
  57. 2026-09-15 06:53 UTCGHSA enrichment
  58. 2026-09-15 01:35 UTCGHSA enrichment
  59. 2026-09-14 13:14 UTCGHSA enrichment
  60. 2026-09-14 08:24 UTCGHSA enrichment
  61. 2026-09-14 04:06 UTCGHSA enrichment
  62. 2026-09-13 23:49 UTCGHSA enrichment
  63. 2026-09-13 19:32 UTCEG score recompute
  64. 2026-09-13 19:32 UTCGHSA enrichment
  65. 2026-09-13 15:06 UTCGHSA enrichment
  66. 2026-09-13 10:44 UTCGHSA enrichment
  67. 2026-09-13 06:27 UTCGHSA enrichment
  68. 2026-09-13 02:10 UTCGHSA enrichment
  69. 2026-09-12 21:52 UTCGHSA enrichment
  70. 2026-09-12 17:35 UTCEG score recompute
  71. 2026-09-12 17:35 UTCGHSA enrichment
  72. 2026-09-12 13:15 UTCGHSA enrichment
  73. 2026-09-12 08:58 UTCGHSA enrichment
  74. 2026-09-12 04:41 UTCGHSA enrichment
  75. 2026-09-12 00:23 UTCGHSA enrichment

Related CVEs(same CWE)

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 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-2026-67873 actively exploited?
CVE-2026-67873 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (52nd percentile of EPSS-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?
A fix for CVE-2026-67873 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-67873 are linked in the Vendor Advisories panel on this page.

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