Uncontrolled Recursion Vulnerability in MuPDF EPUB Rendering Engine
CVE-2025-71382

7.1HIGH

Key Information:

Vendor

Artifexsoftware

Status
MuPDF
Vendor
CVE Published:
23 June 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-71382?

MuPDF, a document rendering software, is vulnerable due to an uncontrolled recursion issue in its EPUB CSS rendering engine. This vulnerability allows remote attackers to exploit deeply nested HTML elements and inline CSS styles in specially crafted EPUB files. By triggering this vulnerability, attackers can exhaust the process stack, resulting in a denial of service for any application that utilizes MuPDF for EPUB rendering. This can render applications crash without proper safeguards in place.

Affected Version(s)

mupdf 0

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-2025-71382 - Proof of Concept

References

https://github.com/ArtifexSoftware/mupdf/releases/tag/1.2...
release-notes
https://bugs.ghostscript.com/show_bug.cgi?id=708840
technical-descriptionexploit
https://github.com/ArtifexSoftware/mupdf/commit/70b71ab22...
patch

CVSS V4

Score:
7.1
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Ishayu Potey
.