w3m through 0.5.3 is prone to an infinite recursion flaw in HTMLlineproc0 because the feed_table_block_tag function in table.c does not prevent a negative indent value.
Created w3m tracking bugs for this issue:
Affects: epel-7 [bug 1539160]
Affects: fedora-all [bug 1539159]
Fixed for all the requested releases.