CVE-2026-6899

MEDIUMPre-NVD 5.65.6—
EchelonGraph scoreHIGH confidence

Score 5.6 from GitHub Security Advisory published 2026-06-09. a secondary CVSS source baseline 5.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
5.6
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.6Exploit: NoneExposed: 0

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

Check for certificate revocation only considers the first matching CRL and ignores other valid CRLs of the same CA in the CycloneCrypto cryptographic wrapper of S2OPC library. It might allow connection between an OPC UA client and server using a revoked certificate.

CVSS v3
5.6
EG Score
5.6(high)
EPSS
1.4%
KEV
Not listed

Published

June 9, 2026

Last Modified

June 9, 2026

Advisory Details (1)

Auto-updated Jun 15, 2026
No patch confirmed yet.
generic

Fix certificate revocation check in crt_verifycrl_and_check_revocation with Cyclone library (#1739) · Issues · Systerel / S2OPC · GitLab

https://gitlab.com/systerel/S2OPC/-/work_items/1739

Vendor Advisories for CVE-2026-6899(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 20× in last 7d / 85× 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. 2026-07-05 23:38 UTCEG score recompute
  2. 2026-07-05 23:38 UTCGHSA enrichment
  3. 2026-07-05 02:31 UTCEPSS rescore
  4. 2026-07-05 02:30 UTCEPSS rescore
  5. 2026-07-05 00:49 UTCEG score recompute
  6. 2026-07-05 00:49 UTCGHSA enrichment
  7. 2026-07-04 06:31 UTCEPSS rescore
  8. 2026-07-04 06:31 UTCEPSS rescore
  9. 2026-07-04 01:29 UTCEG score recompute
  10. 2026-07-04 01:29 UTCGHSA enrichment
  11. 2026-07-03 02:15 UTCEG score recompute
  12. 2026-07-03 02:15 UTCGHSA enrichment
  13. 2026-07-02 03:56 UTCEG score recompute
  14. 2026-07-02 03:56 UTCGHSA enrichment
  15. 2026-07-01 15:07 UTCEPSS rescore
  16. 2026-07-01 05:37 UTCEG score recompute
  17. 2026-07-01 05:36 UTCGHSA enrichment
  18. 2026-06-30 23:22 UTCEPSS rescore
  19. 2026-06-30 07:17 UTCEG score recompute
  20. 2026-06-30 07:17 UTCGHSA enrichment
  21. 2026-06-29 08:11 UTCEG score recompute
  22. 2026-06-29 08:11 UTCGHSA enrichment
  23. 2026-06-28 14:07 UTCEPSS rescore
  24. 2026-06-28 09:20 UTCEG score recompute
  25. 2026-06-28 09:20 UTCGHSA enrichment
Show 60 more
  1. 2026-06-28 04:56 UTCEPSS rescore
  2. 2026-06-27 10:59 UTCEG score recompute
  3. 2026-06-27 10:59 UTCGHSA enrichment
  4. 2026-06-27 03:08 UTCEPSS rescore
  5. 2026-06-26 12:40 UTCEG score recompute
  6. 2026-06-26 12:40 UTCGHSA enrichment
  7. 2026-06-25 12:24 UTCEG score recompute
  8. 2026-06-25 12:24 UTCGHSA enrichment
  9. 2026-06-24 14:05 UTCEG score recompute
  10. 2026-06-24 14:05 UTCGHSA enrichment
  11. 2026-06-23 21:33 UTCEPSS rescore
  12. 2026-06-23 12:11 UTCEG score recompute
  13. 2026-06-23 12:10 UTCGHSA enrichment
  14. 2026-06-22 13:27 UTCEG score recompute
  15. 2026-06-22 13:27 UTCGHSA enrichment
  16. 2026-06-21 11:02 UTCEG score recompute
  17. 2026-06-21 11:02 UTCGHSA enrichment
  18. 2026-06-21 01:59 UTCEPSS rescore
  19. 2026-06-21 01:59 UTCEPSS rescore
  20. 2026-06-20 12:42 UTCEG score recompute
  21. 2026-06-20 12:42 UTCGHSA enrichment
  22. 2026-06-19 19:26 UTCEPSS rescore
  23. 2026-06-19 19:26 UTCEPSS rescore
  24. 2026-06-19 14:19 UTCEG score recompute
  25. 2026-06-19 14:19 UTCGHSA enrichment
  26. 2026-06-18 17:52 UTCEPSS rescore
  27. 2026-06-18 17:52 UTCEPSS rescore
  28. 2026-06-18 15:59 UTCEG score recompute
  29. 2026-06-18 15:59 UTCGHSA enrichment
  30. 2026-06-17 17:53 UTCEPSS rescore
  31. 2026-06-17 17:34 UTCEG score recompute
  32. 2026-06-17 17:34 UTCGHSA enrichment
  33. 2026-06-16 19:16 UTCEG score recompute
  34. 2026-06-16 19:16 UTCGHSA enrichment
  35. 2026-06-16 17:53 UTCEPSS rescore
  36. 2026-06-15 20:58 UTCEG score recompute
  37. 2026-06-15 20:58 UTCGHSA enrichment
  38. 2026-06-15 17:49 UTCEPSS rescore
  39. 2026-06-15 17:49 UTCEPSS rescore
  40. 2026-06-14 23:18 UTCEPSS rescore
  41. 2026-06-14 22:39 UTCEG score recompute
  42. 2026-06-14 22:39 UTCGHSA enrichment
  43. 2026-06-14 00:21 UTCEG score recompute
  44. 2026-06-14 00:21 UTCGHSA enrichment
  45. 2026-06-13 23:00 UTCEPSS rescore
  46. 2026-06-13 01:59 UTCEG score recompute
  47. 2026-06-13 01:59 UTCGHSA enrichment
  48. 2026-06-12 23:12 UTCEPSS rescore
  49. 2026-06-12 23:12 UTCEPSS rescore
  50. 2026-06-12 03:40 UTCEG score recompute
  51. 2026-06-12 03:40 UTCGHSA enrichment
  52. 2026-06-11 14:00 UTCEPSS rescore
  53. 2026-06-11 05:22 UTCEG score recompute
  54. 2026-06-11 05:22 UTCGHSA enrichment
  55. 2026-06-10 22:19 UTCEPSS rescore
  56. 2026-06-10 13:22 UTCEPSS rescore
  57. 2026-06-10 07:04 UTCEG score recompute
  58. 2026-06-10 07:04 UTCGHSA enrichment
  59. 2026-06-09 08:46 UTCEG score recompute
  60. 2026-06-09 08:45 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-6899?
CVE-2026-6899 is a medium vulnerability published on June 9, 2026. Check for certificate revocation only considers the first matching CRL and ignores other valid CRLs of the same CA in the CycloneCrypto cryptographic wrapper of S2OPC library. It might allow connection between an OPC UA client and server using a revoked certificate.
When was CVE-2026-6899 disclosed?
CVE-2026-6899 was first published in the National Vulnerability Database on June 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-6899 actively exploited?
CVE-2026-6899 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-6899?
CVE-2026-6899 has a CVSS v3 base score of 5.6 (NVD).
How do I remediate CVE-2026-6899?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-6899, 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.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-6899

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