|The do_free_upto function in crypto/cms/cms_smime.c in OpenSSL before
0.9.8zg, 1.0.0 before 1.0.0s, 1.0.1 before 1.0.1n, and 1.0.2 before
1.0.2b allows remote attackers to cause a denial of service (infinite
loop) via vectors that trigger a NULL value of a BIO data structure,
as demonstrated by an unrecognized X.660 OID for a hash function.