CVE-2018-6797: heap-buffer-overflow (WRITE of size 1) in S_regatom
(regcomp.c)
A crafted regular expression could cause a heap buffer write overflow,
with control over the bytes written. [perl #132227]
CVE-2018-6798: Heap-buffer-overflow in Perl__byte_dump_string (utf8.c)
Matching a crafted locale dependent regular expression could cause a
heap buffer read overflow and potentially information disclosure. [perl
#132063]
CVE-2018-6913: heap-buffer-overflow in S_pack_rec
pack() could cause a heap buffer write overflow with a large item
count. [perl #131844]