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CVE-2026-3308

Quick assessment

Affected
Artifex Software Inc. *PyMuPDF* MuPDF
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

artifex mupdf是个人开发者的一款富文本编辑器。富文本编辑器不同于文本编辑器，程序员可到网上下载免费的富文本编辑器内嵌于自己的网站或程序里（当然付费的功能会更强大些），方便用户编辑文章或信息。 Artifex MuPDF 1.27.0版本存在安全漏洞，该漏洞源于pdf_load_image_imp函数存在整数溢出，可能导致堆越界写入和任意代码执行。

AI Predicted 9.8 Difficulty: Easy EPSS 0.20% · P8

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-3308

Vulnerability Information
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Vulnerability Title
CVE-2026-3308
Source: CVE Program / CVE List V5
Vulnerability Description
An integer overflow vulnerability in 'pdf-image.c' in Artifex's MuPDF version 1.27.0 allows an attacker to maliciously craft a PDF that can trigger an integer overflow within the 'pdf_load_image_imp' function. This allows a heap out-of-bounds write that could be exploited for arbitrary code execution.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
artifex mupdf 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
artifex mupdf是个人开发者的一款富文本编辑器。富文本编辑器不同于文本编辑器，程序员可到网上下载免费的富文本编辑器内嵌于自己的网站或程序里（当然付费的功能会更强大些），方便用户编辑文章或信息。 Artifex MuPDF 1.27.0版本存在安全漏洞，该漏洞源于pdf_load_image_imp函数存在整数溢出，可能导致堆越界写入和任意代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Artifex Software Inc. *PyMuPDF* MuPDF 0 ~ 1.27.0 -

II. Public POCs for CVE-2026-3308

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III. Intelligence Information for CVE-2026-3308

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Patches & Fixes for CVE-2026-3308 (1)

IV. Related Vulnerabilities

Same product: MuPDF
Same vendor: Artifex Software Inc. *PyMuPDF*

V. Comments for CVE-2026-3308

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