Pyopenssl

This hub aggregates every CVE we track for Pyopenssl, a product in the oss libraries space. Use it to gauge the current risk picture and drill into individual advisories.

Severity distribution

Monthly trend

The 5 most recently published vulnerabilities affecting Pyopenssl.

• CVE-2026-27459pyOpenSSL DTLS cookie callback buffer overflow9.8Mar 17, 2026
• CVE-2026-27448pyOpenSSL allows TLS connection bypass via unhandled callback exception in set_tlsext_servername_callback5.3Mar 17, 2026
• CVE-2018-1000808Python Cryptographic Authority pyopenssl version Before 17.5.0 contains a CWE - 401 : Failure to Release Memory Before Removing Last Reference vulnerability in PKCS #12 Store that can result in Den...5.9Oct 8, 2018
• CVE-2018-1000807Python 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 possi...8.1Oct 8, 2018
• CVE-2013-4314The X509Extension in pyOpenSSL before 0.13.1 does not properly handle a '\0' character in a domain name in the Subject Alternative Name field of an X.509 certificate, which allows man-in-the-middle...4.3Sep 30, 2013