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CVE Vendors Products Updated CVSS v3.1
CVE-2026-27459 2 Pyca, Pyopenssl 2 Pyopenssl, Pyopenssl 2026-03-25 9.8 Critical
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.