What is CVE-2025-55780?

CVE-2025-55780 is a high-severity vulnerability in Artifex Mupdf, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2025-09-23.

How severe is CVE-2025-55780?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2025-55780 known to be exploited?

3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

NULL pointer dereference in Artifex Mupdf

CVE-2025-55780

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…

EPSS: 0.004 (32.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Artifex Mupdf
N/a — versions n/a

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

Public proof-of-concept exploits

References

cve@mitre.org (Third Party Advisory, Issue Tracking)
cve@mitre.org (Third Party Advisory)
cve@mitre.org (Permissions Required)

Frequently asked questions

What is CVE-2025-55780?: CVE-2025-55780 is a high-severity vulnerability in Artifex Mupdf, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2025-09-23.
How severe is CVE-2025-55780?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2025-55780 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.