fix cve issue 42506269

.github/workflows/ci.yml

@@ -10,6 +10,7 @@ on:
       - master
       - develop
       - feature/**
+      - cve-*
   pull_request:
   release:
     types: [published, created, edited]

include/boost/regex/v5/basic_regex_parser.hpp

@@ -997,7 +997,7 @@ bool basic_regex_parser<charT, traits>::parse_repeat(std::size_t low, std::size_
       if((m_position != m_end)
          && (0 == (this->flags() & regbase::main_option_type)) 
          && (this->m_traits.syntax_type(*m_position) == regex_constants::syntax_plus))
-      {
+      { 
          possessive = true;
          ++m_position;
       }
@@ -1114,6 +1114,13 @@ bool basic_regex_parser<charT, traits>::parse_repeat(std::size_t low, std::size_
                   else
                      contin = false;
                   break;
+               case regex_constants::syntax_hash:
+                  if (this->flags() & regex_constants::mod_x) {
+                     while((m_position != m_end) && !is_separator(*m_position++)){}
+                     contin = true;
+                     break;
+                  }
+                  BOOST_REGEX_FALLTHROUGH;
                default:
                   contin = false;
                }

include/boost/regex/v5/regbase.hpp

@@ -19,6 +19,8 @@
 #ifndef BOOST_REGEX_V5_REGBASE_HPP
 #define BOOST_REGEX_V5_REGBASE_HPP
 
+#include <boost/regex/config.hpp>
+
 namespace boost{
 //
 // class regbase

test/Jamfile.v2

@@ -137,6 +137,7 @@ compile test_windows_defs_4.cpp ;
 run issue153.cpp : : : "<toolset>msvc:<linkflags>-STACK:2097152" ;
 run issue227.cpp ;
 run issue232.cpp ;
+run issue244.cpp ;
 run lookbehind_recursion_stress_test.cpp ;
 run regex_replace_overflow.cpp ;
 

test/issue244.cpp

@@ -0,0 +1,21 @@
+#include <boost/regex.hpp>
+
+#include <string>
+
+#include "test_macros.hpp"
+
+int main()
+{
+   char const strdata1[] = "\x00t\x03.z%(?x:]*+\x0c#\\x0c\x0c\x0c+\x0c#\\x0c\x0c\x0c\x11\x0c\x0c\xff\xff\xfd*\xff\xff\xff\xff\xff\xff\xff\xff|\xff\xff\xfd*\xff\xff)*\x01\x03\x00\x00\x00\x03\xff\xff\xff\x00\x00\xff\xff\xff";
+   char const strdata2[] = "(?x:]*+#comment\n+)*";
+
+   std::string str1(strdata1, strdata1 + sizeof(strdata1) - 1);
+   std::string str2(strdata2, strdata2 + sizeof(strdata2) - 1);
+
+   boost::match_results<std::string::const_iterator> what;
+
+   BOOST_TEST_THROWS((boost::regex(str1)), boost::regex_error);
+   BOOST_TEST_THROWS((boost::regex(str2)), boost::regex_error);
+
+   return boost::report_errors();
+}