skvadrik re2c ast.cc check_and_merge_special_rules null pointer dereference

A flaw has been found in skvadrik re2c up to 4.4. Impacted is the function check_and_merge_special_rules of the file src/parse/ast.cc. This manipulation causes null pointer dereference. The attack can only be executed locally. The exploit has been published and may be used. Patch name: febeb977936f9519a25d9fbd10ff8256358cdb97. It is suggested to install a patch to address this issue.

A stack overflow re2c 2.2 exists due to infinite recursion issues in src/dfa/dead_rules.cc.

re2c: heap-based buffer overflow in Scanner::fill in parse/scanner.cc

re2c 1.3 has a heap-based buffer overflow in Scanner::fill in parse/scanner.cc via a long lexeme.

re2c: uncontrolled recursion that causes stack consumption in find_fixed_tags

re2c before 2.0 has uncontrolled recursion that causes stack consumption in find_fixed_tags.