Race condition in CRL checking code. Upgrade to 0.9.7e. Zlib 1.2.1 is vulnerable to a denial-of-service condition. See http://www.kb.cert.org/vuls/id/238678. Upgrade to 1.2.2. libpng 1.2.7 is vulnerable to a crash bug. See http://www.libpng.org/pub/png/libpng.html. Upgrade to 1.2.8.