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pyopenssl vulnerabilities

Vulnerabilities published for pyopenssl in the last 30 days: 0. Listed in the KEV catalogue: 0.

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Vulnerabilities: 2

  1. CVE-2026-27459

    High · CVSS 7.2EPSS 0.73%Fix available

    pyOpenSSL DTLS cookie callback buffer overflow

    pyOpenSSL is a Python wrapper around the OpenSSL library. Starting in version 22.0.0 and prior to version 26.0.0, if a user provided callback to `set_cookie_generate_callback` returned a cookie value greater than 256 bytes, pyOpenSSL would overflow an OpenSSL provided buffer. Starting in version 26.0.0, cookie values that are too long are now rejected.

    pyopensslOperating systems
    • Update to 23.2.0-1ubuntu0.1
    Published Updated
    Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗

  2. CVE-2026-27448

    Low · CVSS 1.7EPSS 0.25%Fix available

    pyOpenSSL allows TLS connection bypass via unhandled callback exception in set_tlsext_servername_callback

    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.

    pyopensslOperating systems
    • Update to 23.2.0-1ubuntu0.1
    Published Updated
    Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗

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