CVE-2026-45389

CRITICAL CVSS 9.1 View on NVD ↗

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).

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References

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

Published: Jun 15, 2026 20:16 UTC Modified: Jun 16, 2026 15:35 UTC