ModSecurity support for LUA 5.5 series

[tangent1al]

ModSecurity 2.X for Apache currently supports LUA series 5.0 through to 5.4, as checked by apache2\msc_lua.c

    /* Create new state. */
#if LUA_VERSION_NUM == 502 || LUA_VERSION_NUM == 503 || LUA_VERSION_NUM == 504 || LUA_VERSION_NUM == 501
    L = luaL_newstate();
#elif LUA_VERSION_NUM == 500
    L = lua_open();
#else
#error We are only tested under Lua 5.0, 5.1, 5.2, 5.3, or 5.4.
#endif

LUA 5.5 was released in December 2025, so could ModSecurity 2.X series be tested/updated to support this later version please?

[airween]

Hi @tangent1al,

with which version you try? I've already fixed this last month, see #3456 especially commit 6d6deb1.

[tangent1al]

This was building modsecurity-v2.9.12 on Windows using CMake with VS18. LUA 5.5.0 previously built and installed ok.

The following error is produced.

[ 71%] Building C object CMakeFiles/mod_security2.dir/apache2/msc_lua.c.obj
	"C:\Program Files\Microsoft Visual Studio\18\Community\Common7\IDE\CommonExtensions\Microsoft\CMake\CMake\bin\cmake.exe" -E cmake_cl_compile_depends --dep-file=CMakeFiles\mod_security2.dir\apache2\msc_lua.c.obj.d --working-dir=C:\Development\apache24\build\modsecurity --filter-prefix="Note: including file: " -- C:\PROGRA~1\MICROS~1\18\COMMUN~1\VC\Tools\MSVC\1450~1.357\bin\Hostx64\x64\cl.exe @C:\Temp\nmAEA7.tmp
msc_lua.c
C:\Development\apache24\src\modsecurity-v2.9.12\apache2\msc_lua.c(441): fatal error C1189: #error:  We are only tested under Lua 5.0, 5.1, 5.2, 5.3, or 5.4.
NMAKE : fatal error U1077: '"C:\Program Files\Microsoft Visual Studio\18\Community\Common7\IDE\CommonExtensions\Microsoft\CMake\CMake\bin\cmake.exe" -E cmake_cl_compile_depends --dep-file=CMakeFiles\mod_security2.dir\apache2\msc_lua.c.obj.d --working-dir=C:\Development\apache24\build\modsecurity --filter-prefix="Note: including file: " -- C:\PROGRA~1\MICROS~1\18\COMMUN~1\VC\Tools\MSVC\1450~1.357\bin\Hostx64\x64\cl.exe @C:\Temp\nmAEA7.tmp' : return code '0x2'
Stop.

No issues building ModSecurity against LUA 5.4.8.

[airween]

This was building modsecurity-v2.9.12 on Windows using CMake with VS18. LUA 5.5.0 previously built and installed ok.

Yes, v2.9.12 was released on 5th of August, 2025. The fix was merged on 18th of January, 2026. It's not released yet.

Could you try to fetch that from the v2/master branch?

[tangent1al]

Downloading the updated file from v2/master/apache2/msc_lua.c, rebuilding and linking against lua55.lib completes without error. Thank you.

Will await an updated release of 2.x.