Double Free Vulnerability in Artifex MuPDF Software
CVE-2026-112036

5.3MEDIUM

Key Information:

Vendor

Artifex
Status
MuPDF
Vendor
CVE Published:
19 October 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-112036?

A vulnerability has been identified in the Artifex MuPDF software, specifically within the Signature Locking component. The flaw, which affects the free_char_list function in the source/pdf/pdf-xref.c file, can be exploited via remote manipulation, leading to potential software instability due to double free conditions. Users and administrators are advised to apply the patch 3984925b660afb8a781ddf504021e91be1bc671e to mitigate the risk associated with this vulnerability.

Affected Version(s)

MuPDF 1.28.0

MuPDF 1.28.1

MuPDF 1.28.2

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-2026-112036 - Proof of Concept

References

https://vuldb.com/vuln/421684
vdb-entrytechnical-description
https://vuldb.com/vuln/421684/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-112036
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
Low
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

suyuanwang (VulDB User)
.