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

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Wed, 17 Jun 2026 05:15:00 +0000

Type Values Removed Values Added
Title OCaml‑TLS Insufficient Certificate Validation Enables Server Impersonation

Tue, 16 Jun 2026 14:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-295
Metrics cvssV3_1

{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Tue, 16 Jun 2026 14:00:00 +0000

Type Values Removed Values Added
First Time appeared Ocaml
Ocaml ocaml
Vendors & Products Ocaml
Ocaml ocaml

Mon, 15 Jun 2026 19:30:00 +0000

Type Values Removed Values Added
Description In OCaml-TLS before 2.1.0, the client implementation does insufficient checks of the certificate provided by the server, which allows impersonation with certificates that are not meant for server authentication (because of KeyUsage and ExtendedKeyUsage).
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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-06-16T13:57:42.571Z

Reserved: 2026-05-12T00:00:00.000Z

Link: CVE-2026-45388

cve-icon Vulnrichment

Updated: 2026-06-16T13:52:20.350Z

cve-icon NVD

Status : Deferred

Published: 2026-06-15T20:16:28.350

Modified: 2026-06-16T15:35:16.600

Link: CVE-2026-45388

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-17T00:15:16Z

Weaknesses