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    CVE-2026-45388

    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).

    Published:Jun 15, 2026
    Last Modified:Jun 17, 2026
    EPS:Jun 15, 2026
    EPSS Score:0.00313
    CVSS Score:9.1

    Affected Products

    Vendor
    Ocaml
    Product
    Ocaml

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-295 Improper Certificate Validation

    Related CVEs

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    CVE-2018-9838 (CVSS 9.8) — The caml_ba_deserialize function in byterun/bigarray.c in the standard library in OCaml 4.06.0 has an integer …
    CVE-2017-9779 (CVSS 7.8) — OCaml compiler allows attackers to have unspecified impact via unknown vectors, a similar issue to CVE-2017-97…
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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High