PT-2025-39197 · Artifex+2 · Mupdf+2

Published 2025-09-23 · Updated 2026-02-17 · CVE-2025-55780

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions MuPDF version 1.26.4

Description A flaw exists in MuPDF where a null pointer dereference can occur within the break word for overflow wrap() function when processing a malformed EPUB document. This happens because the function calls fz html split flow() to split a FLOW WORD node without verifying the validity of node->next before accessing node->next->overflow wrap. If the split operation fails or produces an incomplete node chain, this can lead to a crash.

Recommendations Update to a newer version that contains a fix for this vulnerability.

Exploit

Fix

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

ALT-PU-2025-13180

CVE-2025-55780

OPENSUSE-SU-2026:10214-1

Affected Products

Alt Linux

Debian

Mupdf

References · 18

• 🔥 https://github.com/ISH2YU/CVE-2025-55780/tree/main · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2025-55780 · Security Note
• https://osv.dev/vulnerability/openSUSE-SU-2026:10214-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-55780 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2025-55780 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2025-55780 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2025-55780 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2025-55780 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2025-55780 · Vendor Advisory
• https://t.me/cveNotify/136397 · Telegram Post
• https://suse.com/security/cve/CVE-2025-55780 · Note
• https://suse.com/security/cve/CVE-2026-25556 · Note
• https://t.me/CVEtracker/33181 · Telegram Post
• https://cgit.ghostscript.com/cgi-bin/cgit.cgi/mupdf.git/commit/?id=bdd5d241748807378a78a622388e0312332513c5 · Note
• https://twitter.com/VulmonFeeds/status/1970595631371583678 · Twitter Post