CVE-2026-45388
Received Received - Intake
BaseFortify

Publication date: 2026-06-15

Last updated on: 2026-06-15

Assigner: MITRE

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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Meta Information
Published
2026-06-15
Last Modified
2026-06-15
Generated
2026-06-16
AI Q&A
2026-06-15
EPSS Evaluated
N/A
NVD
CVE-2026-45388
EUVD
EUVD-2026-36764
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
ocaml_tls ocaml_tls to 2.1.0 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability exists in OCaml-TLS versions before 2.1.0. The client implementation does not properly verify the server's certificate, specifically failing to check the KeyUsage and ExtendedKeyUsage fields. This flaw allows an attacker to impersonate a server using certificates that are not intended for server authentication.

Impact Analysis

Because the client does not correctly validate server certificates, an attacker could impersonate a legitimate server. This could lead to man-in-the-middle attacks, where sensitive information might be intercepted or altered without the user's knowledge.

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