CVE-2025-55780: NULL Pointer Dereference

A null pointer dereference occurs in the function breakwordforoverflowwrap in MuPDF 1.26.4 when rendering a malformed EPUB document. Specifically, the function calls fzhtmlsplitflow to split a FLOWWORD node, but does not check if node-next is valid before accessing node-next-overflowwrap, resulti...