CVE-2026-45389

CRITICALPre-NVD 7.49.1▲
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-06-15. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.4; sources differ by 1.7.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.4Exploit: NoneExposed: 0

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

In OCaml-TLS before 2.1.0, the server implementation does insufficient checks of the certificate provided by the client (when doing client authentication), which allows impersonation with certificates that are not meant for client authentication (because of KeyUsage and ExtendedKeyUsage).

CVSS v3
7.4
EG Score
9.1(medium)
EG Risk
41(Track)
EG Risk 41/100SSVC: 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
Severity91% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
9%
KEV
Not listed

Published

June 15, 2026

Last Modified

June 17, 2026

Advisory Details (1)

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

OSV - Open Source Vulnerabilities

https://osv.dev/vulnerability/OSEC-2026-07

Vendor Advisories for CVE-2026-45389(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 11× in last 7d / 130× 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 192 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-45389?
CVE-2026-45389 is a critical vulnerability published on June 15, 2026. In OCaml-TLS before 2.1.0, the server implementation does insufficient checks of the certificate provided by the client (when doing client authentication), which allows impersonation with certificates that are not meant for client authentication (because of KeyUsage and ExtendedKeyUsage).
When was CVE-2026-45389 disclosed?
CVE-2026-45389 was first published in the National Vulnerability Database on June 15, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-45389 actively exploited?
CVE-2026-45389 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 91.0% of all scored CVEs.
What is the CVSS score of CVE-2026-45389?
CVE-2026-45389 has a CVSS v3.1 base score of 7.4 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.1.
How do I remediate CVE-2026-45389?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45389, 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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