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6 vulnerabilities found for pyopenssl by pyopenssl

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
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
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-2018-1000807 (GCVE-0-2018-1000807)

Vulnerability from nvd – Published: 2018-10-08 00:00 – Updated: 2024-08-05 12:47
VLAI?
Summary
Python Cryptographic Authority pyopenssl version prior to version 17.5.0 contains a CWE-416: Use After Free vulnerability in X509 object handling that can result in Use after free can lead to possible denial of service or remote code execution.. This attack appear to be exploitable via Depends on the calling application and if it retains a reference to the memory.. This vulnerability appears to have been fixed in 17.5.0.
Severity ?
No CVSS data available.
CWE
  • n/a
Assigner
References
Date Public ?
2017-11-29 00:00
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
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
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-2018-1000807 (GCVE-0-2018-1000807)

Vulnerability from cvelistv5 – Published: 2018-10-08 00:00 – Updated: 2024-08-05 12:47
VLAI?
Summary
Python Cryptographic Authority pyopenssl version prior to version 17.5.0 contains a CWE-416: Use After Free vulnerability in X509 object handling that can result in Use after free can lead to possible denial of service or remote code execution.. This attack appear to be exploitable via Depends on the calling application and if it retains a reference to the memory.. This vulnerability appears to have been fixed in 17.5.0.
Severity ?
No CVSS data available.
CWE
  • n/a
Assigner
References
Date Public ?
2017-11-29 00:00
Show details on NVD website
To clipboard 

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