Critical severity9.1NVD Advisory· Published Jun 15, 2026· Updated Jun 16, 2026
CVE-2026-45389
CVE-2026-45389
Description
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).
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Affected products
1Patches
Vulnerability mechanics
References
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