Security Advisory

CVE-2025-55780

CVE vulnerability detail — eXtreme Datacenter Security Operations

Published 2025-09-23 00:00:00

Last updated 2025-09-25 14:47:03

Assigner mitre

State PUBLISHED

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.

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