Null Pointer Dereference in MuPDF EPUB Rendering
CVE-2025-55780

7.5HIGH

Key Information:

Vendor

Artifex Software

Status
MuPDF
Vendor
CVE Published:
23 September 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-55780?

A flaw exists within the MuPDF library, specifically in version 1.26.4 where a null pointer dereference can occur in the function responsible for rendering malformed EPUB documents. When handling a FLOW_WORD node, the function fails to authenticate the validity of a pointer before accessing it. This oversight can lead to application crashes, particularly if the rendering process encounters an error or results in a truncated node chain.

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Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2025-55780
Created by ISH2YU

References

https://bugs.ghostscript.com/show_bug.cgi?id=708720
https://github.com/ISH2YU/CVE-2025-55780/tree/main
https://cgit.ghostscript.com/cgi-bin/cgit.cgi/mupdf.git/c...

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

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