Description

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.

INFO

Published Date :

2026-03-17T23:34:28.483Z

Last Modified :

2026-03-18T19:52:15.812Z

Source :

GitHub_M
AFFECTED PRODUCTS

The following products are affected by CVE-2026-27459 vulnerability.

Vendors Products
Pyca
  • Pyopenssl
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-27459.

URL Resource
https://github.com/pyca/pyopenssl/blob/358cbf29c4e364c59930e53a270116249581eaa3/CHANGELOG.rst cve-icon cve-icon cve-icon
https://github.com/pyca/pyopenssl/commit/57f09bb4bb051d3bc2a1abd36e9525313d5cd408 cve-icon cve-icon cve-icon
https://github.com/pyca/pyopenssl/security/advisories/GHSA-5pwr-322w-8jr4 cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-27459 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-27459 cve-icon
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CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
Attack Vector
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SS Confidentiality
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Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact