{"action":"Upgrade pyopenssl to 0.13.1 or later.","affected":[{"fixed":"0.13.1","introduced":"0"}],"component":"pyopenssl","cve_ids":["CVE-2013-4314"],"ecosystem":"PyPI","epss":0.01197,"exploited":false,"fixed_versions":["0.13.1"],"ghsa_id":"GHSA-6748-36qp-fx6r","id":"tcs_01M5KG5VHC3BDBXYEN6P6KJGAV","modified_at":"2026-06-10T17:01:45.680612135Z","published_at":"2013-09-30T21:55:00Z","references":["https://osv.dev/vulnerability/PYSEC-2013-31","http://www.openwall.com/lists/oss-security/2013/09/06/2","https://mail.python.org/pipermail/pyopenssl-users/2013-September/000478.html","https://bugzilla.redhat.com/show_bug.cgi?id=1005325","http://www.ubuntu.com/usn/USN-1965-1","http://www.debian.org/security/2013/dsa-2763","http://lists.opensuse.org/opensuse-updates/2013-11/msg00015.html","https://github.com/advisories/GHSA-6748-36qp-fx6r"],"severity":{"label":"unknown"},"sources":[{"source":"osv","source_id":"PYSEC-2013-31","url":"https://osv.dev/vulnerability/PYSEC-2013-31"}],"summary":"The 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 at"}