CVE-2026-45389 — HIGH (7.4)

Vulnerability 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 Score

7.4

HIGH

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

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

NONE

Related Weaknesses (CWE)

CWE-295

References

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

FAQ

What is CVE-2026-45389?

CVE-2026-45389 is a vulnerability with a CVSS score of 7.4 (HIGH). 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...

How severe is CVE-2026-45389?

CVE-2026-45389 has been rated HIGH with a CVSS base score of 7.4/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-45389?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.