CVE-2026-45389
High
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).
SeverityHigh
CVSS7.4
Exploit probability—
ProductOCaml-TLS
PublishedJun 15, 2026
First seenJun 15, 2026
Weakness typeCWE-295CWE-295
How to fix
Update
- OCaml OCaml-TLS2.1.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| OCaml OCaml-TLS | No range specified | 2.1.0 |
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