If your game is crashing naturally, you should provide these logs to the official Cfx.re Forum for troubleshooting.
These files frequently contain Trojans or stealers designed to compromise the user's PC rather than the server. They may target your Discord tokens, browser passwords, or GTA V license information.
A notable exploit involved sending invalid weapon info to the server, which has since been addressed in official FiveM updates.
If functional, they utilize known vulnerabilities—such as invalid weapon information or specific dlcpack overflows—to force a server-side crash. Impact on FiveM Servers
It is important to distinguish this from the legitimate or CitizenFX_log.zip files generated by the FiveM client itself.