CVE Feed

    Dashboard / CVE / CVE-2026-27448

    CVE-2026-27448

    pyOpenSSL is a Python wrapper around the OpenSSL library. Starting in version 0.14.0 and prior to version 26.0.0, if a user provided callback to `set_tlsext_servername_callback` raised an unhandled exception, this would result in a connection being accepted. If a user was relying on this callback for any security-sensitive behavior, this could allow bypassing it. Starting in version 26.0.0, unhandled exceptions now result in rejecting the connection.

    Published:Mar 17, 2026
    Last Modified:Mar 24, 2026
    EPS:Mar 17, 2026
    EPSS Score:0.00038
    CVSS Score:5.3

    Affected Products

    Vendor
    Pyca
    Product
    Pyopenssl
    Vendor
    Pyopenssl
    Product
    Pyopenssl

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    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