The compile_branch function in pcre_compile.c in PCRE 8.x before 8.39
and pcre2_compile.c in PCRE2 before 10.22 mishandles patterns
containing an (*ACCEPT) substring in conjunction with nested
parentheses, which allows remote attackers to execute arbitrary code
or cause a denial of service (stack-based buffer overflow) via a
object encountered by Konqueror, aka ZDI-CAN-3542.
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