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Vulnerability record · CVE-2025-55780 · published 23 September 2025

CVE-2025-55780: Artifex mupdf null pointer dereference vulnerability

Artifex · Mupdf

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.

7.5 CVSS 3.1 High EPSS 0.43% · top 64.8% CWE-476 · NULL pointer dereference
7.5CVSS 3.1 base score
0.43%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugs.ghostscript.com/show_bug.cgi?id=708720 Issue TrackingThird Party Advisory
https://cgit.ghostscript.com/cgi-bin/cgit.cgi/mupdf.git/commit/?id=bdd5d241748807378a78a622388e0312332513c5 Permissions Required
https://github.com/ISH2YU/CVE-2025-55780/tree/main Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2025-55780), CISA KEV, FIRST EPSS (scores of 2026-10-12). This page is refreshed as NVD updates the record.