mupdf: A null pointer dereference occurs in the function break_word_for_overflow_wrap() in MuPDF 1.26.4 when rendering a mal...
CVE-2025-55780 is fixed in mupdf on 1 platform, first by DEBIAN-CVE-2025-55780, released September 23, 2025. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| mupdf · Debian 14 | 1.27.0+ds1-2 | DEBIAN-CVE-2025-55780 | Sep 23, 2025 |
| mupdf · opensuse-leap 16.0 | 1.27.2-bp160.1.1 | OPENSUSE-SU-2026:21180-1 | Jun 30, 2026 |
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