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High DSA-2763-1 1 CVE

pyopenssl - hostname check bypassing

Published Sep 24, 2013 · Updated Mar 9, 2026

Fixed packages 2

ReleasePackageFixed in
Debian · 6.0 pyopenssl 0.10-1+squeeze1
Debian · 7 pyopenssl 0.13-2+deb7u1

Vulnerabilities 1

  • High 7.5

    PyOpenSSL Mishandles NUL Byte In Certificate Subject Alternative Name

    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 attackers to spoof arbitrary SSL servers via a crafted certif…