CVE-2025-55780
MuPDF Null Pointer Dereference Vulnerability
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.
INFO
Published Date :
Sept. 23, 2025, 6:15 p.m.
Last Modified :
Oct. 8, 2025, 6:04 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Update MuPDF to the latest version.
- Apply vendor patches if available.
- Avoid processing malformed EPUB files.
Public PoC/Exploit Available at Github
CVE-2025-55780 has a 3 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-55780.
| URL | Resource |
|---|---|
| https://bugs.ghostscript.com/show_bug.cgi?id=708720 | Issue Tracking Third 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 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-55780 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-55780
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Null Pointer De-reference in MUPDF 1.26.4
监控Github最新网络安全相关的仓库...
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📡 PoC auto collect from GitHub. ⚠️ Be careful Malware.
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Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-55780 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-55780 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Oct. 08, 2025
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:artifex:mupdf:*:*:*:*:*:*:*:* versions from (including) 1.24.0 up to (excluding) 1.26.7 Added Reference Type MITRE: https://bugs.ghostscript.com/show_bug.cgi?id=708720 Types: Issue Tracking, Third Party Advisory Added Reference Type MITRE: https://cgit.ghostscript.com/cgi-bin/cgit.cgi/mupdf.git/commit/?id=bdd5d241748807378a78a622388e0312332513c5 Types: Permissions Required Added Reference Type MITRE: https://github.com/ISH2YU/CVE-2025-55780/tree/main Types: Third Party Advisory -
CVE Modified by [email protected]
Sep. 25, 2025
Action Type Old Value New Value Added Reference https://cgit.ghostscript.com/cgi-bin/cgit.cgi/mupdf.git/commit/?id=bdd5d241748807378a78a622388e0312332513c5 Added Reference https://github.com/ISH2YU/CVE-2025-55780/tree/main -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Sep. 24, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-476 -
New CVE Received by [email protected]
Sep. 23, 2025
Action Type Old Value New Value Added 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. Added Reference https://bugs.ghostscript.com/show_bug.cgi?id=708720