CVE-2025-55780 | BDVDB-2026-295321 Detail

Description#

A null pointer dereference occurs in the function break_word_for_overflow_wrap() in MuPDF 1.26.4 when rendering a malformed EPUB document. Specifically, the function calls fz_html_split_flow() to split a FLOW_WORD node, but does not check if node->next is valid before accessing node->next->overflow_wrap, resulting in a crash if the split fails or returns a partial node chain.

Impact#

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Exploit#

History#

1. Version 12025-09-23Record published in the CVE List.
2. Version 22025-09-25Most recent update recorded in the CVE List.