PoC Index

CVE-2025-55780

HIGH 7.5EPSS 0.4%

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.

CVSS v3.1
7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
0.43% chance of exploitation in the next 30 days, 36th percentile
Published
2025-09-23
Updated
2025-09-25

Proof-of-concept exploits (1)

References

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