CVE-2025-55780
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-09-23

Last updated on: 2025-10-08

Assigner: MITRE

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.
CVSS Scores
EPSS Scores
Probability:
Percentile:
Meta Information
Published
2025-09-23
Last Modified
2025-10-08
Generated
2026-06-16
AI Q&A
2025-09-23
EPSS Evaluated
2026-06-15
NVD
CVE-2025-55780
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
artifex mupdf From 1.24.0 (inc) to 1.26.7 (exc)
Helpful Resources
Exploitability
CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-476 The product dereferences a pointer that it expects to be valid but is NULL.
Attack-Flow Graph
AI Quick Actions
Instant insights powered by AI
Executive Summary

This vulnerability is a null pointer dereference in the MuPDF 1.26.4 software. It occurs in the function break_word_for_overflow_wrap() when rendering a malformed EPUB document. The function calls fz_html_split_flow() to split a FLOW_WORD node but does not verify if the next node is valid before accessing its overflow_wrap property. If the split fails or returns an incomplete node chain, this leads to a crash.

Impact Analysis

The vulnerability can cause MuPDF to crash when processing malformed EPUB documents. This could lead to denial of service or application instability when opening such files.

Chat Assistant
Ask questions about this CVE
Hi! I’m here to help you understand CVE-2025-55780. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70
EPSS Chart