pcre: buffer overflow caused by recursive back reference by name within certain group (8.38/4)

Heap-based buffer overflow in PCRE 8.34 through 8.37 and PCRE2 10.10 allows remote attackers to execute arbitrary code via a crafted regular expression, as demonstrated by /^?P=B?P=B?J:?Pc?Pa?P=BWGXCREDITS/, a different vulnerability than CVE-2015-8384...