[Bug libstdc++/117394] New: evil regex causes a stack overflow and a crash

[vincent.lebourlot at starqube dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117394

            Bug ID: 117394
           Summary: evil regex causes a stack overflow and a crash
           Product: gcc
           Version: 15.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: vincent.lebourlot at starqube dot com
  Target Milestone: ---

Following code causes a crash when compiled with g++ 15 (gcc (GCC) 15.0.0
20240715 (experimental))

#include <regex>
#include <string>

int main(){
    std::string s(15000,'a');
    std::regex r3("a(\\r|.)*");
    std::regex_match(s.begin(),s.end(),r3);
    return 0;
}