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    4 vulnerabilities found for pyopenssl by pyca

    CVE-2026-27459 (GCVE-0-2026-27459)

    Vulnerability from nvd – Published: 2026-03-17 23:34 – Updated: 2026-03-18 19:52
    VLAI
    Title
    pyOpenSSL DTLS cookie callback buffer overflow
    Summary
    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.
    Severity
    7.2 (High)
    CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U
    SSVC
    Exploitation: none Automatable: no Technical Impact: total
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
    Assigner
    References
    Impacted products
    Vendor Product Version
    pyca pyopenssl Affected: >= 22.0.0, < 26.0.0
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2026-27448 (GCVE-0-2026-27448)

    Vulnerability from nvd – Published: 2026-03-17 23:24 – Updated: 2026-03-18 20:18
    VLAI
    Title
    pyOpenSSL allows TLS connection bypass via unhandled callback exception in set_tlsext_servername_callback
    Summary
    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.
    Severity
    1.7 (Low)
    CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-636 - Not Failing Securely ('Failing Open')
    Assigner
    References
    Impacted products
    Vendor Product Version
    pyca pyopenssl Affected: >= 0.14.0, < 26.0.0
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2026-27459 (GCVE-0-2026-27459)

    Vulnerability from cvelistv5 – Published: 2026-03-17 23:34 – Updated: 2026-03-18 19:52
    VLAI
    Title
    pyOpenSSL DTLS cookie callback buffer overflow
    Summary
    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.
    Severity
    7.2 (High)
    CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U
    SSVC
    Exploitation: none Automatable: no Technical Impact: total
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
    Assigner
    References
    Impacted products
    Vendor Product Version
    pyca pyopenssl Affected: >= 22.0.0, < 26.0.0
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2026-27448 (GCVE-0-2026-27448)

    Vulnerability from cvelistv5 – Published: 2026-03-17 23:24 – Updated: 2026-03-18 20:18
    VLAI
    Title
    pyOpenSSL allows TLS connection bypass via unhandled callback exception in set_tlsext_servername_callback
    Summary
    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.
    Severity
    1.7 (Low)
    CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-636 - Not Failing Securely ('Failing Open')
    Assigner
    References
    Impacted products
    Vendor Product Version
    pyca pyopenssl Affected: >= 0.14.0, < 26.0.0
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-27448",
    "datePublished": "2026-03-17T23:24:30.661Z",
    "dateReserved": "2026-02-19T17:25:31.100Z",
    "dateUpdated": "2026-03-18T20:18:08.768Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}