Two vulnerabilities were discovered in GnuPG, the GNU privacy guard, a free PGP replacement. The Common Vulnerabilities and Exposures project identifies the following problems: CVE-2013-4351 When a key or subkey had its "key flags" subpacket set to all bits off, GnuPG currently would treat the key as having all bits set. That is, where the owner wanted to indicate "no use permitted", GnuPG would interpret it as "all use permitted". Such "no use permitted" keys are rare and only used in very special circumstances. CVE-2013-4402 Infinite recursion in the compressed packet parser was possible with crafted input data, which may be used to cause a denial of service.