Multiple security vulnerabilities have been identified in the Qt 6 QtBase software toolkit, including NULL pointer dereference, out-of-bounds reads, and denial-of-service conditions affecting various Qt Core and Qt Network modules. These issues can lead to application crashes and potential exposure of sensitive information when processing crafted inputs or interacting with malicious servers. The vulnerabilities affect versions prior to 6.5.2-18.oe2403sp1 and have been addressed in that fixed release.